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Continental Shelf

Continental shelf

The continental shelf is the extended perimeter of each continent, which is covered during interglacial periods such as the current epoch by relatively shallow seas (known as shelf seas) and gulfs. The shelf usually ends at a gradual slope (called the shelf break). The sea bottom below the break is the continental slope. The slope merges into the deep ocean floor, the abyssal plain. The width of the continental shelf varies significantly. It is common for an area to have virtually no shelf at all, especially where the forward edge of an advancing oceanic plate dives beneath continental crust in an offshore subduction zone such as off the coasts of Chile or the west coast of Sumatra. The largest shelf—the Siberian shelf in the Arctic Ocean—stretches to 1500 kilometers in width. The South China Sea lies over another extensive area of continental shelf, the Sunda shelf, which joins Borneo, Sumatra, and Java to the Asian mainland. Other familiar bodies of water that overlie continental shelves are the North Sea and the Persian Gulf. The average width of continental shelves is about 80 kilometers. The depth of the shelf also varies. It may be as shallow as 30 m or as deep as 600 m. Along the continental shelves sediment is carried from erosion of the land. Combined with the sunlight available in shallow waters, the continental shelves teem with life compared to the biotic desert of the oceans' abyssal plain. If anoxic conditions in the sedimentary deposits prevail, the shelves may in geologic time become sources of fossil fuels. The relatively accessible continental shelf is by far the best understood part of the ocean floor. Most commercial exploitation, such as oil and gas extraction, from the sea takes place on the continental shelf. Sovereign rights over their continental shelves were claimed by the marine nations that signed the Convention on the Continental Shelf drawn up by the UN's International Law Commission in 1958,[http://www.un.org/law/ilc/texts/contsh.htm] partly superseded by the 1982 United Nations Convention on the Law of the Sea.

External links

- [http://www.onr.navy.mil/focus/ocean/regions/oceanfloor2.htm Office of Naval Research: Ocean Regions]Continental Margin & Rise Category:Physical oceanography Category:Aquatic biomes ja:大陸棚

Continent

shows land mass with minimal distortion as only one continuous continent]] A continent (Latin continere, "to hold together") is a large continuous land mass. There are several conceptions of what a continent is, geographic, geologic, and tectonic.

Geographic continents

Because geography is defined by local convention, there are several conceptions as to which landmasses qualify as continents. There are names for six, but America is often divided, and Europe is often united with Asia. Ignoring cases where Antarctica is omitted, there are half a dozen lists. tectonic The 7-continent model is usually taught in Western Europe, the United States, Australia, and much of Asia. In Canada, the government-approved [http://atlas.gc.ca/site/english/maps/reference/international/world/referencemap_image_view Atlas of Canada] names 7 continents and teaches Oceania instead of Australia. The 6-continent combined-America model is taught in Iran, and Latin America. The 6-continent Eurasia model is preferred by the scientific community, and as such is commonly found in all parts of the world, but is especially used in Russia and other countries of Eastern Europe, and in Japan. Historians may use the 5-continent model in which North Africa is separated from Sub-Saharan Africa and attached to Eurasia (Jared Diamond) or the 4-continent Afro-Eurasian model (Andre Gunder Frank). In its original sense, "continent" meant (and still means) mainland. In the Greco-Roman world, there was but one known, the Continent, which we today call the Old World. In the mid 1600s Peter Heylin wrote in his Cosmographie that "A Continent is a great quantity of Land, not separated by any Sea from the rest of the World, as the whole Continent of Europe, Asia, Africa." As late as 1727 Ephraim Chambers wrote in his Cyclopædia, "The world is ordinarily divided into two grand continents: the old and the new." However, since Classical times this Continent was divided into "peninsulas" which also came to be called continents, since they were great land masses themselves. Through the Middle Ages, there were three such continents in the Western conception: Europe, Africa, and Asia. The European discovery of America in 1492 made four; and Australia in 1606 would make five, though not right away: as late as 1813 geographers wrote of Australia as "New Holland, an immense Island, which some geographers dignify with the appellation of another continent". However, dividing America in two was commonplace by this time, and would also produce a fifth continent. The idea of the Five Continents is still strong in Europe and Asia, and is represented by the five rings on the Olympic flag. Antarctica was sighted in 1820, for the sixth and last continent to be given a separate name, though a great "antarctic" (antipodean) landmass had been anticipated for millennia. Dividing the Americas now made seven continents, nicely symmetrical with the magical number of the Seven Seas, Seven Heavens, and the seven heavenly bodies that gave their names to the seven days of the week. However, this division never appealed to Latin America, which saw itself spanning America as a single landmass, and there the conception of six continents remains, as it does in scattered other countries such as Japan. From a modern perspective, the continent with the least reason for separate recognition is Europe, and in scientific circles people generally prefer to subsume Europe and Asia into Eurasia. This appealed to Russia, which spans Eurasia, and in Russia and (at least formerly) in Eastern Europe, Eurasia is or was taught as being one of six continents. Geographers and historians often find it useful to define larger land masses connected by land bridges: # Africa-Eurasia (also called Eurafrasia): the combined land mass of Africa and Eurasia; # America (or the Americas): the combined land mass of North America and South America; # Laurasia: the combined land mass of Eurasia and North America, which were connected by Beringia during the Ice Age; # Sahul: the combined land mass of Australia, New Guinea, and Tasmania during the Ice Age. That is, during the last Ice Age, there were three large landmasses: Africa-Eurasia + America (which has no name), Sahul, and Antarctica. These larger land masses are usually considered supercontinents rather than continents, however. In the last century it has also become conventional to subdivide Eurasia into the regions of Europe, Asia, and the Middle East. America is often divided into the regions of North America, Central America, and South America. Continents are also sometimes subdivided into subcontinents that are isolated by geological features. The prototype of this is the Indian subcontinent. Islands are usually considered to belong geographically to the continent they are closest to. The Coral Sea and South Pacific islands may be associated with Australia/Australasia to form the "continent" of Oceania (though the Pacific islands without Australia are also called Oceania). The British Isles have always been considered part of Europe, and Greenland is considered part of North America. When the Continent is referred to without clarification by a speaker of British English, it is usually presumed to mean Continental Europe, that is Europe, explicitly excluding Great Britain and Ireland. The Continental United States excludes Hawaii. Contiguous or Co(n)terminous United States means the United States without Alaska or Hawaii (the "Lower 48"), but it is very common for people to say continental for contiguous. See also List of countries by continent, Satellite Images of Continents.

Geologic continents

Geologically, the surface of Earth consists of many tectonic plates, consisting of rigid lithospheric mantle and crust moving together over the much less viscous asthenosphere. Continental crust is primarily granitic in composition, overlain by sedimentary and metamorphic rocks. Much of the continental crust extends above sea level as dry land. Oceanic crust is basaltic in composition, and much thinner than continental crust, thus generally lying below sea level. Although from a human perspective shallow inland seas such as the Bering Sea appear to divide up land masses into continents, such ephemeral features do not define continents geologically. For instance, many times over the past few million years, the continents of Eurasia and America were connected by dry land. A geologic continent, therefore, is a continuous piece of continental crust, whether wet or dry at a particular time. As such, Laurasia and Africa-Arabia are one continent, which for the past three million years has also been linked to South America. This world-spanning land mass has no name except for the Classical meaning of "The Continent". The other large geologic continents are Sahul and Antarctica, but there are many so-called microcontinents as well: Madagascar, the Seychelles (the northern Mascarene Plateau), New Zealand, New Caledonia, etc., which are splinters of the ancient supercontinent of Gondwana. Note that volcanic Iceland is an exposed bit of oceanic crust at the mid-ocean ridge, and therefore not a microcontinent. Likewise, the British Isles, Sri Lanka, Borneo, and Newfoundland are integral parts of the Laurasian continent which happen to be separated by shallow (and temporary) inland seas flooding its margins.

Tectonic plates

During the 20th century, it became accepted by geologists that continents move location on the face of the planet over the geologic timescale, a process known as continental drift, explained by the theory of plate tectonics. It is the tectonic plates that have drifted, broken apart and joined together over time to give rise to the continents we now recognize. Consequently, in the geological past and prior to the present continents, other continents existed - see :Category:Historical continents. Occasionally there are calls for the continents to be defined by the tectonic plates that carry them. However, not only would this make Arabia on the Arabian plate and India on the Indian plate continents, but also Central America on the Caribbean plate and California on the Pacific plate, and this definition has never been widely accepted.

Ice age

An ice age is a period of long-term downturn in the temperature of Earth's climate, resulting in an expansion of the continental ice sheets, polar ice sheets and mountain glaciers ("glaciation"). Glaciologically, ice age is often used to mean a period of ice sheets in the northern and southern hemispheres; by this definition we are still in an ice age (because the Greenland and Antarctic ice sheets still exist). More colloquially, when speaking of the last few million years, ice age is used to refer to colder periods with extensive ice sheets over the North American and European continents: in this sense, the last ice age ended about 10,000 years ago. This article will use the term ice age in the former, glaciological, sense; and use the term 'glacial periods' for colder periods during ice ages and 'interglacial' for the warmer periods. During the last few million years, there have been many glacial periods, occurring initially at 40,000-year frequency but more recently at 100,000-year frequencies. These are the best studied. There have been four major ice ages in the further past.

Origin of ice age theory

The idea that, in the past, glaciers had been far more extensive was folk knowledge in some alpine regions of Europe (Imbrie and Imbrie, p25, quote a woodcutter telling de Charpentier of the former extent of the Swiss Grimsel glacier). No single person invented the idea [http://academic.emporia.edu/aberjame/histgeol/agassiz/glacial.htm]. Between 1825 and 1833, Jean de Charpentier assembled evidence in support of this idea. In 1836 Charpentier convinced Louis Agassiz of the theory, and Agassiz published it in his book Étude sur les glaciers of 1840. At this early stage of knowledge, what were being studied were the glacial periods within the past few hundred thousand years, during the current ice age. The far earlier ice ages' very existence was unsuspected.

Major ice ages

There have been at least four major ice ages in the Earth's past. The earliest hypothesized ice age is believed to have occurred around 2.7 to 2.3 billion (10⁹) years ago during the early Proterozoic Age. :Main article: Snowball Earth. The earliest well-documented ice age, and probably the most severe of the last 1 billion years, occurred from 800 to 600 million years ago (the Cryogenian period) and it has been suggested that it produced a Snowball Earth in which permanent sea ice extended to or very near the equator. It has been suggested that the end of this ice age was responsible for the subsequent Cambrian Explosion, though this theory is recent and controversial. A minor ice age occurred from 460 to 430 million years ago, during the Late Ordovician Period. There were extensive polar ice caps at intervals from 350 to 260 million years ago, during the Carboniferous and early Permian Periods. early Permian The present ice age began 40 million years ago with the growth of an ice sheet in Antarctica, but intensified during the Pleistocene (starting around 3 million years ago) with the spread of ice sheets in the Northern Hemisphere. Since then, the world has seen cycles of glaciation with ice sheets advancing and retreating on 40,000 and 100,000 year time scales. The last glacial period ended about 10,000 years ago. The timing of ice ages throughout geologic history is in part controlled by the position of the continental plates on the surface of the Earth. When landmasses are concentrated near the polar regions, there is an increased chance for snow and ice to accumulate. Small changes in solar energy can tip the balance between summers in which the winter snow mass completely melts and summers in which the winter snow persists until the following winter. Due to the positions of Greenland, Antarctica, and the northern portions of Europe, Asia, and North America in polar regions, the Earth today is considered prone to ice age glaciations. Evidence for ice ages comes in various forms, including rock scouring and scratching, glacial moraines, drumlins, valley cutting, and the deposition of till or tillites and glacial erratics. Successive glaciations tend to distort and erase the geological evidence, making it difficult to interpret. It took some time for the current theory to be worked out. Analyses of ice cores and ocean sediment cores unambiguously show the record of glacials and interglacials over the past few million years.

Interglacials

glacial erratic In between ice ages, there are multi-million year periods of more temperate climate, but also within the ice ages (or at least within the last one), temperate and severe periods occur. The colder periods are called 'glacial periods', the warmer periods 'interglacials', such as the Eemian interglacial era. We are in an interglacial period now, the last retreat ending about 10,000 years ago. There appears to be a folk wisdom that "the typical interglacial period lasts ~12,000 years" but this is hard to substantiate from the evidence of ice core records. For example, an article in Nature [http://www.nature.com/cgi-taf/DynaPage.taf?file=/nature/journal/v429/n6992/abs/nature02599_fs.html] argues that the current interglacial might be most analogous to a previous interglacial that lasted 28,000 years. Nonetheless, fear of a new glacial period starting soon does exist (See: global cooling). However, many now believe that anthropogenic (manmade) forcing from increased "greenhouse gases" would outweigh any Milankovitch (orbital) forcing; and some recent considerations of the orbital forcing have even argued that in the absence of human perturbations the present interglacial could potentially last 50,000 years.

Causes of ice ages

The cause of ice ages remains controversial for both the large-scale ice age periods and the smaller ebb and flow of glacial/interglacial periods within an ice age. The general consensus is that it is a combination of up to three different factors: atmospheric composition (particularly the fraction of CO₂ and methane), changes in the Earth's orbit around the Sun known as Milankovitch cycles (and possibly the Sun's orbit around the galaxy), and the arrangement of the continents. The first of these three factors is probably responsible for much of the change, especially for the first ice age. The "Snowball Earth" hypothesis maintains that the severe freezing in the late Proterozoic was both caused and ended by changes in CO₂ levels in the atmosphere. However, the other two factors do matter. An abundance of land within the Arctic and Antarctic Circles appears to be a necessity for an ice age, probably because the landmasses provide space on which snow and ice can accumulate during cooler times and thus trigger positive feedback processes like albedo changes. The Earth's orbit does not have a great effect on the long-term causation of ice ages, but does seem to dictate the pattern of multiple freezings and thawings that take place within the current ice age. The complex pattern of changes in Earth's orbit and the change of albedo may influence the occurrence of glacial and interglacial phases — this was first explained by the theory of Milutin Milankovic. The present ice ages are the most studied and best understood, particularly the last 400,000 years, since this is the period covered by ice cores that record atmospheric composition and proxies for temperature and ice volume. Within this period, the match of glacial/interglacial frequencies to the Milankovic orbital forcing periods is so good that orbital forcing is the generally accepted explanation. The combined effects of the changing distance to the sun, the precession of the Earth's axis, and the changing tilt of the Earth's axis can change and significantly redistribute the sunlight received by the Earth. Of particular importance are changes in the tilt of the Earth's axis, which impact the intensity of seasons. For example, the amount of solar influx in July at 65 degrees north latitude is calculated to vary by as much as 25% (from 400 W/m² to 500 W/m², see graph at [http://www.museum.state.il.us/exhibits/ice_ages/insolation_graph.html]). It is widely believed that ice sheets advance when summers become too mild to melt all of the accumulated snowfall from the previous winter. Some workers believe that the strength of the orbital forcing appears to be too small to trigger glaciations, but feedback mechanisms like CO₂ may explain this mismatch. While Milankovic forcing predicts that cyclic changes in the Earth's orbital parameters can be expressed in the glaciation record, additional explanations are necessary to explain which cycles are observed to be most important in the timing of glacial/interglacial periods. In particular, during the last 800 thousand years, the dominant inter/glacial oscillation has been 100 thousand years, which corresponds to changes in Earth's eccentricity and orbital inclination, and yet is by far the weakest of the three frequencies predicted by Milankovic. During the period 3.0 — 0.8 million years ago, the dominant pattern of glaciation corresponded to the 41 thousand year period of changes in Earth's obliquity (tilt of the axis). The reasons for preferring one frequency to another are poorly understood and an active area of current research, but the answer probably relates to some form of resonance in the Earth's climate system. The "traditional" Milankovitch explanation struggles to explain the dominance of the 100,000-year cycle over the last 8 cycles. Richard A. Muller and Gordon J. MacDonald [http://www.pnas.org/cgi/content/full/94/16/8329] [http://muller.lbl.gov/pages/glacialmain.htm] [http://muller.lbl.gov/papers/sciencespectra.htm] and others have pointed out that those calculations are for a two-dimensional orbit of Earth but the three-dimensional orbit also has a 100 thousand year cycle of orbital inclination. They proposed that these variations in orbital inclination lead to variations in insolation, as the earth moves in and out of known dust bands in the solar system. Although this is a different mechanism to the traditional view, the "predicted" periods over the last 400,000 years are nearly the same. The Muller and MacDonald theory, in turn, has been challenged by Rial [http://pangea.stanford.edu/Oceans/GES290/Rial1999.pdf]. Another worker, Ruddiman has suggested a plausible model that explains the 100,000 cycle by the modulating effect of eccentricity (weak 100,000 year cycle) on precession (23,000 year cycle) combined with greenhouse gas feedbacks in the 41,000 and 23,000-year cycles. Yet another theory has been advanced by Peter Huybers who argued that the 41,000-year cycle has always been dominant, but that the Earth has entered a mode of climate behavior where only the 2nd or 3rd cycle triggers an ice age. This would imply that the 100,000-year periodicity is really an illusion created by averaging together cycles lasting 80 and 120 thousand years. This theory is consistent with the existing uncertainties in dating, but not widely accepted at present (Nature 434, 2005, [http://web.mit.edu/~phuybers/www/Doc/Obliquity_HuybersWunsch.pdf]).

Recent glacial and interglacial phases

Richard A. Muller See Timeline of glaciation.

Glaciation in North America

The Wisconsinan glaciation has had a considerable effect on the landscape of the Northern Hemisphere. In North America, the Great Lakes and the Finger Lakes were carved by ice's deepening of old valleys. The old Teays River drainage system was radically altered and largely reshaped into the Ohio River drainage system. Other rivers were dammed and diverted to new channels, such as the Niagara, which formed a dramatic waterfall and gorge, when the waterflow encountered a limestone escarpment. Another similar waterfall near Syracuse, New York is now dry. Long Island was formed from glacial till, and the watersheds of Canada were so severely disrupted that they are still sorting themselves out — the plethora of lakes on the Canadian Shield in northern Canada can be almost entirely attributed to the action of the ice. As the ice retreated and the rock dust dried, winds carried the material hundreds of miles, forming beds of loess many dozens of feet thick in the Missouri Valley. Isostatic rebound continues to reshape the Great Lakes and other areas formerly under the weight of the ice sheets. The Driftless Zone, around the junction of Wisconsin, Minnesota, and Iowa, was not covered by glaciers.

Reference

- Imbrie, John and Katherine Palmer Imbrie. Ice ages: Solving the Mystery. Cambridge, Massachusetts: Harvard University Press, 1979, 1986 (reprint). ISBN 089490020X; ISBN 0894900153; ISBN 0674440757.

External links

- [http://www.pbs.org/wgbh/nova/ice/ Cracking the Ice Age] from PBS
- http://www.globalchange.umich.edu/globalchange1/current/lectures/samson/climate_patterns/ Category:Glaciology Category:History of climate ms:Zaman air batu ja:氷河期

Gulf

- A gulf or bay is a part of a lake or ocean that extends so that it is surrounded by land on three sides. See headlands and bays for more on this.
- Gulf is also a novella by Robert A. Heinlein.
- A company, see Gulf Oil

Oceanic crust

Oceanic crust is the part of Earth's lithosphere which underlies the ocean basins. It is thinner (generally less than 10 km thick) but more dense than continental crust, about 3.3 g/cc (grams per cubic centimeter). Oceanic crust is composed of mafic basaltic rocks. Most of the present day oceanic crust is less than 200 million years old because it is continuously being created at oceanic ridges and destroyed by being pulled back into the mantle in subduction zones by the processes of plate tectonics. Category:Plate tectonics

Continental crust

The continental crust is the layer of granitic and sedimentary rock which forms the continents and the areas of shallow seabed close to their shores, known as continental shelves. It is less dense and more rigid than the material of the Earth's mantle and thus "floats" on top of it. Continental crust is also less dense than oceanic crust, though it is considerably thicker, averaging 20 to 80 km versus the average oceanic thickness of around 5-10 km. As a consequence, when active margins of continental crust meet oceanic crust in subduction zones, the oceanic crust is subducted. Its relative low density keeps the continental crust from being subducted or re-cycled back into the mantle. For this reason the oldest rocks on Earth are within the "cratons" or cores of the continents, rather than in repeatedly recycled oceanic crust. Continental crust is thickest beneath mountain ranges with a deep root. This fact results from the isostatic uplift associated with orogeny (mountain formation). As it is still being formed today, the amount of continental crust has been increasing over geological time. About 40% of the Earth's surface is now underlain by continental crust.

External link

- [http://www.geo.cornell.edu/geology/classes/geochemdata/CrustalAbundances.html Average composition of Continental Crust]
- [http://earth.leeds.ac.uk/assyntgeology/extra_info/ehistory.htm Making new continents] Category:Plate tectonics ko:대륙 지각

Chile

The Republic of Chile is a country in South America occupying a long coastal strip between the Andes mountains and the Pacific Ocean. It shares borders with Argentina to the east, Bolivia to the northeast and Peru to the north.

Origin of the name

There are various theories about the origin of the word Chile. According to one theory the Incas of Peru, who had failed to conquer the Araucanians, called the valley of the Aconcagua "Chili" by corruption of the name of a tribal chief ("cacique") called Tili, who ruled the area at the time of the Incan conquest. Another theory points to the similarity of the valley of the Aconcagua with that of the Casma in Peru, where there was a town and valley named Chili. Other theories say Chile may derive its name from the indigenous Mapuche word chilli, which may mean "where the land ends" or "the deepest point of the Earth," or from the Aymara tchili meaning "snow"; another meaning attributed to chilli is the onomatopoeic cheele-cheele—the Mapuche imitation of a bird call. The Spanish conquistadors heard about this name from the Incas and the few survivors of Diego de Almagro's first Spanish expedition south from Peru in 1535-36 called themselves the "men of Chilli."

History

About 10,000 years ago, migrating Native Americans settled in fertile valleys and along the coast of what is now Chile. The Incas briefly extended their empire into what is now northern Chile, but the area's remoteness and the fierce opposition of the native population prevented extensive settlement. Inca In 1520, while attempting to circumnavigate the earth, the Portuguese Ferdinand Magellan, discovered the southern passage now named after him, the Straits of Magellan. The next Europeans to reach Chile were Diego de Almagro and his band of Spanish conquistadors, who came from Peru in 1535 seeking gold but were turned back by the local population. The Spanish encountered hundreds of thousands of Indians from various cultures in the area that modern Chile now occupies. These cultures supported themselves principally through slash-and-burn agriculture and hunting. The first permanent European settlement, Santiago, was founded in 1541 by Pedro de Valdivia, one of Francisco Pizarro's lieutenants. Although the Spanish did not find the extensive gold and silver they sought, they recognized the agricultural potential of Chile's central valley, and Chile became part of the Viceroyalty of Peru. Conquest of the land that is today called Chile took place only gradually, and the Europeans suffered repeated setbacks at the hands of the local population. A massive Mapuche insurrection that began in 1553 resulted in Valdivia's death and the destruction of many of the colony's principal settlements. Subsequent major insurrections took place in 1598 and in 1655. Each time the Mapuche and other native groups revolted, the southern border of the colony was driven northward. The abolition of slavery in 1683 defused tensions on the frontier between the colony and the Mapuche land to the south, and permitted increased trade between colonists and Mapuches. The drive for independence from Spain was precipitated by usurpation of the Spanish throne by Napoleon's brother Joseph, in 1808. A national junta in the name of Ferdinand—heir to the deposed king—was formed on September 18, 1810. The junta proclaimed Chile an autonomous republic within the Spanish monarchy. A movement for total independence soon won a wide following. Spanish attempts to reimpose arbitrary rule during what was called the Reconquista led to a prolonged struggle. monarchy Intermittent warfare continued until 1817, when an army led by Bernardo O'Higgins, Chile's most renowned patriot, and José de San Martín, hero of Argentine independence, crossed the Andes into Chile and defeated the royalists. On February 12, 1818, Chile was proclaimed an independent republic under O'Higgins' leadership. The political revolt brought little social change, however, and 19th century Chilean society preserved the essence of the stratified colonial social structure, which was greatly influenced by family politics and the Roman Catholic Church. The system of presidential absolutism eventually predominated, but wealthy landowners continued to control Chile. Toward the end of the 19th century, the government in Santiago consolidated its position in the south by ruthlessly suppressing the Mapuche Indians, finally completing the conquest begun more than three centuries earlier. In 1881, the government signed a treaty with Argentina confirming Chilean sovereignty over the Strait of Magellan. As a result of the War of the Pacific with Peru and Bolivia (1879-83), Chile expanded its territory northward by almost one-third, eliminating Bolivia's access to the Pacific, and acquired valuable nitrate deposits, the exploitation of which led to an era of national affluence. The Chilean Civil War in 1891 brought about a redistribution of power between the President and Congress, and Chile established a parliamentary style democracy. However, the Civil War had also been a contest between those who favored the development of local industries and powerful Chilean banking interests, particularly the House of Edwards who had strong ties to foreign investors. Hence the Chilean economy partially degenerated into a system protecting the interests of a ruling oligarchy. By the 1920s, the emerging middle and working classes were powerful enough to elect a reformist president, Arturo Alessandri Palma, whose program was frustrated by a conservative congress. Alessandri Palma's reformist tendencies were partly tempered later by an admiration for some elements of Mussolini's Italian Corporate State. In the 1920s, Marxist groups with strong popular support arose. A military coup led by General Luis Altamirano in 1924 set off a period of great political instability that lasted until 1932. The longest lasting of the ten governments between those years was that of General Carlos Ibáñez, who briefly held power in 1925 and then again between 1927 and 1931 in what was a de facto dictatorship, although not really comparable in harshness or corruption to the type of military dictatorship that has often bedeviled the rest of Latin America, and certainly not comparable to the violent and repressive regime of Augusto Pinochet decades later. By relinquishing power to a democratically elected successor, Ibáñez del Campo retained the respect of a large enough segment of the population to remain a viable politician for more than thirty years, in spite of the vague and shifting nature of his ideology. When constitutional rule was restored in 1932, a strong middle-class party, the Radicals, emerged. It became the key force in coalition governments for the next 20 years. During the period of Radical Party dominance (1932-52), the state increased its role in the economy. In 1952, voters returned Ibáñez, now reincarnated as a sort of Chilean Perón, to office for another 6 years. Jorge Alessandri succeeded Ibáñez in 1958, bringing Chilean conservatism back into power democratically for another term. The 1964 presidential election of Christian Democrat Eduardo Frei Montalva by an absolute majority initiated a period of major reform. Under the slogan "Revolution in Liberty," the Frei administration embarked on far-reaching social and economic programs, particularly in education, housing, and agrarian reform, including rural unionization of agricultural workers. By 1967, however, Frei encountered increasing opposition from leftists, who charged that his reforms were inadequate, and from conservatives, who found them excessive. At the end of his term, Frei had accomplished many noteworthy objectives, but he had not fully achieved his party's ambitious goals. In 1970, Senator Salvador Allende Gossens, a Marxist physician and member of Chile's Socialist Party, who headed the "Popular Unity" (UP or "Unidad Popular") coalition of the Socialist, Communist, Radical, and Social-Democratic Parties, along with dissident Christian Democrats, the Popular Unitary Action Movement (MAPU), and the Independent Popular Action, won a plurality of votes in a three-way contest. Despite pressure from the government of the United States, the Chilean Congress, keeping with tradition, conducted a runoff vote between the leading candidates, Allende and former president Jorge Alessandri and chose Allende by a vote of 153 to 35. Frei refused to form an alliance with Alessandri to oppose Allende, on the grounds that the Christian Democrats were a workers party and could not make common cause with the oligarchs. Allende's program included advancement of workers' interests; a thoroughgoing implementation of agrarian reform; the reorganization of the national economy into socialized, mixed, and private sectors; a foreign policy of "international solidarity" and national independence; and a new institutional order (the "people's state" or "poder popular"), including the institution of a unicameral congress. The Popular Unity platform also called for nationalization of foreign (U.S.) ownership of Chile's major copper mines. An economic depression that began in 1967 peaked in 1970, exacerbated by capital flight, plummeting private investment, and withdrawal of bank deposits by those opposed to Allende's socialist program. Production fell and unemployment rose. Allende adopted measures including price freezes, wage increases, and tax reforms, which had the effect of increasing consumer spending and redistributing income downward. Joint public-private public works projects helped reduce unemployment. Much of the banking sector was nationalized. Many enterprises within the copper, coal, iron, nitrate, and steel industries were expropriated, nationalized, or subjected to state intervention. Industrial output increased sharply and unemployment fell during the Allende administration's first year. Other reforms undertaken during the early Allende period included redistribution of millions of hectares of land to landless agricultural workers as part of the agrarian reform program, giving the armed forces an overdue pay increase, and providing free milk to children. The Indian Peoples Development Corporation and the Mapuche Vocational Institute were founded to address the needs of Chile's indigenous population. The nationalization of U.S. and other foreign-owned companies led to increased tensions with the United States. The Nixon administration brought international financial pressure to bear in order to restrict economic credit to Chile. Simultaneously, the CIA funded opposition media, politicians, and organizations, helping to accelerate a campaign of domestic destabilization. Interestingly, a CIA plan to buy the cooperation of Chilean members of Congress failed due to the shortage of sufficiently corruptible representatives. By 1972, the economic progress of Allende's first year had been reversed and the economy was in crisis. Political polarization increased, and large mobilizations of both pro- and anti-government groups became frequent, often leading to clashes. By early 1973, inflation was out of control. The crippled economy was further battered by prolonged and sometimes simultaneous strikes by physicians, teachers, students, truck owners, copper workers, and the small business class. A military coup supported by the CIA overthrew Allende on September 11, 1973. As the armed forces bombarded the presidential palace (Palacio de La Moneda), Allende reportedly committed suicide. A military government, led by General Augusto Pinochet Ugarte, took over control of the country. The first years of the regime were marked by serious human rights violations. On October 1973, at least 70 persons were murdered by the Caravan of Death. At least a thousand people were executed during the first six months of Pinochet in office, and at least two thousand more were killed during the next sixteen years, as reported by the Valech Report. Some 30,000 were forced to flee the country. A new Constitution was approved by a highly irregular and undemocratic plebiscite characterized by the absence of registration lists, on September 11, 1980, and General Pinochet became President of the Republic for an 8-year term. In the late 1980s, the regime gradually permitted greater freedom of assembly, speech, and association, to include trade union and limited political activity. The right-wing military government pursued decidedly laissez-faire economic policies. During its nearly 17 years in power, Chile moved away from economic statism toward a largely free market economy that fostered an increase in domestic and foreign private investment, although the copper industry and other important mineral resources were not returned to foreign ownership. In a plebiscite on October 5, 1988, General Pinochet was denied a second 8-year term as president. Chileans elected a new president and the majority of members of a two-chamber congress on December 14, 1989. Christian Democrat Patricio Aylwin, the candidate of a coalition of 16 political parties called the Concertación, received an absolute majority of votes. President Aylwin served from 1990 to 1994. In December 1993, Christian Democrat Eduardo Frei Ruiz-Tagle, the son of previous president Eduardo Frei Montalva, led the Concertación coalition to victory with an absolute majority of votes. President Frei's administration was inaugurated in March 1994. A presidential election was held on December 12, 1999, but none of the six candidates obtained a majority, which led to an unprecedented runoff election on January 16, 2000. Ricardo Lagos Escobar of the Socialist Party led the Concertación coalition to a narrow victory, with 51.31% of the votes. He was sworn in March 11, 2000, for a 6-year term.

Politics

Chile's Constitution was approved in a tightly controlled national plebiscite in September 1980, under the military government of Augusto Pinochet. It entered into force in March 1981. After Pinochet's defeat in the 1988 plebiscite, the Constitution was amended to ease provisions for future amendments to the Constitution. In 2005 over 50 reforms were approved, which eliminated the remaining undemocratic areas of the text, such as the existence of non-elected Senators (institutional senators, or senators for life) and the inability of the President to remove the Commander in Chief of the Armed Forces. These reforms led the President to controversially declare Chile's transition to democracy as complete. Chile's bicameral Congress has a 48-seat Senate—38 elected, 9 appointed, 1 for life—and a 120-member Chamber of Deputies. Deputies are elected every 4 years. Senators serve for 8 years with staggered terms. The current Senate is evenly split 24-24 between pro-government and opposition Senators. Nine institutional senators were appointed in 1999, and two "senators for life," former Presidents Pinochet (who resigned in 2002) and Frei. (Chile's Constitution provided that former presidents who have served at least 6 years shall be entitled to a lifetime senate seat.) The last congressional elections were held in December 2001. The current lower house—the Chamber of Deputies—contains 60 members of the governing center-left coalition and 56 from the center-right opposition. Currently 4 Deputies have their voting rights suspended on legal grounds. The Congress is located in the port city of Valparaíso, about 140 kilometers (84 mi.) west of the capital, Santiago. Chile's congressional elections are governed by a unique binomial system that rewards coalition slates. Each coalition can run two candidates for the two Senate and two lower chamber seats apportioned to each chamber's electoral districts. Typically, the two largest coalitions split the seats in a district. Only if the leading coalition ticket out-polls the second-place coalition by a margin of more than 2-to-1 does the winning coalition gain both seats. In the 2001 congressional elections, the conservative Independent Democratic Union surpassed the Christian Democrats for the first time to become the largest party in the lower house. The Communist Party again failed to gain any seats in the 2001 elections. The next presidential and congressional elections are set for December 2005. (See Chilean presidential election, 2005.) Chile's judiciary is independent and includes a court of appeal, a system of military courts, a constitutional tribunal, and the Supreme Court. Chile will complete in mid-2005 a multi-year overhaul of its criminal justice system. The reform has replaced inquisitorial proceedings with an adversarial system more similar to that of the United States.

Regions

Chile is divided into 13 regions, each of which is headed by an intendente. Every region is further divided into provinces with a Gobernador Provincial. Finally each province is divided into various Comunas each with its own mayor. Intendentes and gobernadores are appointed by the president, mayors are elected by popular vote. Each region is designated by a name and a Roman numeral. Numbers are assigned from north to south. In general the Roman numeral is used, rather than the name. The only exception is the region where Santiago is situated, which is designated RM, that stands for Región Metropolitana, Metropolitan Region.

Geography

Roman numeral Roman numeral A long and narrow coastal region on the west side of the Andes Mountains, Chile stretches over 4,630 km (2,880 miles) north to south, but only 430 km (265 mi) at its widest point east to west. The northern Atacama desert contains great mineral wealth, primarily copper and nitrates. The relatively small Central Valley, which includes Santiago, dominates the country in terms of population and agricultural resources. This area also is the historical center from which Chile expanded in the late 19th century, when it integrated the northern and southern regions. Southern Chile is rich in forests and grazing lands and features a string of volcanoes and lakes. The southern coast is a labyrinth of fjords, inlets, canals, twisting peninsulas, and islands. The Andes Mountains are located on the eastern border. Chile is the longest (N-S) country in the world (over 4,200km), and also claims a large section of Antarctica as part of its territory. Chile controls Easter Island, the easternmost island of Polynesia, which it incorporated to its territory in 1888, and Robinson Crusoe Island, more than 600 km from the mainland, in the Juan Fernández archipelago.

Economy

Juan Fernández After a decade of impressive growth rates, Chile experienced a moderate downturn in 1999 brought on by the global economic slowdown. The economy remained sluggish until 2003, when it began to show clear signs of recovery, achieving 3.3% real GDP growth. The Chilean economy finished 2004 with growth of 6.1%. Most experts expect GDP growth of around 6% in 2005. Chile has pursued generally sound economic policies for nearly three decades. The 1973-90 military government sold many state-owned companies, and the three democratic governments since 1990 have continued privatization at a slower pace. The government's role in the economy is mostly limited to regulation, although the state continues to operate copper giant Codelco and a few other enterprises. Chile is strongly committed to free trade and has welcomed large amounts of foreign investment. Chile has signed Free Trade agreements (FTAs) with several important economies, including an FTA with the United States, which was signed in 2003 and implemented in January 2004. High domestic savings and investment rates also helped propel Chile's economy to average growth rates of 8% during the 1990s. The privatized national pension system has encouraged domestic investment and contributed to an estimated total domestic savings rate of approximately 21% of GDP in 2003. Unemployment has hovered in the 8%-10% range in recent years, well above the 5%-6% average for the 1990s. Unemployment remained at 8.8% at the end of 2004 in spite of strong economic growth. Wages have risen faster than inflation as a result of higher productivity, boosting national living standards. The share of Chileans with incomes below the poverty line--defined as twice the cost of satisfying a person's minimal nutritional needs--fell from 46% of the population in 1987 to 18.8% in 2003. Chile's independent Central bank pursues a policy of maintaining inflation between 2% and 4%. Inflation has not exceeded 5% since 1998. Chile registered inflation of 2.4% in 2004 and is expected to see a 2.5% increase in 2005. Most wage settlements and spending decisions are indexed, reducing inflation's volatility. Under the compulsory private pension system, most formal sector employees pay 10% of their salaries into privately managed funds. Total foreign direct investment rose to $7.1 billion in 2004, up from $2.5 billion in 2003. Both foreign and domestic investment in Chile had declined during the country’s period of slower economic growth from 1999-2003, but appear to be recovering strongly. The Chilean Government committed, in early 2002, to undertake a series of microeconomic reforms designed to create new incentives for private investment. The government also has encouraged the use of Chile as an "investment platform" for multinational corporations planning to invest in the region. Chile's welcoming attitude toward foreign direct investment is codified in the country's Foreign Investment Law, which gives foreign investors the same treatment as Chileans. Registration is simple and transparent, and foreign investors are guaranteed access to the official foreign exchange market to repatriate their profits and capital. The U.S.-Chile Free Trade Agreement offers a number of other investor protections.

Foreign Trade

Chile's economy is highly dependent on international trade. In 2004, exports accounted for about 34% of GDP. Chile has traditionally been dependent upon copper exports; the state-owned firm Codelco is the world's largest copper-producing company. Nontraditional exports have grown faster than those of copper and other minerals. In 1975, non-mineral exports made up just over 30% of total exports, whereas now they account for about 60%. The most important non-mineral exports are forestry and wood products, fresh fruit and processed food, fishmeal and seafood, and wine. The trade balance for 2004 showed a historic surplus $9 billion, considerably higher than 2003. Total exports in 2004 were $32 billion, a 52.1% increase from $20.4 billion in 2003. Chile's export markets are fairly balanced among Europe (25.1%), Asia (33.1%), Latin America (15.7%), and North America (19%). The U.S., the largest national market, takes in 17.3% of Chile's exports. Asia has been the fastest-growing export market in recent years. Chilean imports increased 30% in 2004, to $23 billion, reflecting a positive change in consumer demand and economic recovery. Capital goods made up about 66% of total imports. The United States represented 14.6% of Chilean imports in 2004. As a bloc, the European Union (EU) in 2004 supplied 16.3% of Chile's imports, while Argentina contributed 16%. Chile unilaterally lowered its across-the-board import tariff for all countries with which it does not have a trade agreement to 6% in 2003. Higher effective tariffs are charged only on imports of wheat, wheat flour, and sugar as a result of a system of import price bands. The price bands were ruled inconsistent with Chile's WTO obligations in 2002 and the government has introduced legislation to modify them. Chile will have to phase out the price bands within 12 years under the terms of the U.S.-Chile FTA. Successive Chilean governments have actively pursued liberalizing trade agreements. During the 1990s, Chile signed FTAs with Canada, Mexico, and Central America. Chile also concluded preferential trade agreements with Venezuela, Colombia, and Ecuador. An association agreement with Mercosur--Argentina, Brazil, Paraguay, and Uruguay--went into effect in October 1996. Chile, a member of the Asia-Pacific Economic Cooperation (APEC) organization, is seeking to boost commercial ties to Asian markets. Continuing its export-oriented development strategy, Chile completed landmark free trade agreements in 2002 with the European Union and South Korea. After two years of negotiations, the United States and Chile signed an agreement in June 2003. The agreement will lead to completely duty free bilateral trade within 12 years. The U.S.-Chile FTA entered into force January 1, 2004 following approval by the U.S and Chilean congresses. Chile is a strong proponent of pressing ahead on negotiations for a Free Trade Area of the Americas (FTAA). Chile also has signed trade agreements with China, as well as a four -partite agreement with Singapore, New Zealand and the Kingdom of Brunei Darussalam (P4). Currently it is negotiating with India.

Finance

Chile's financial sector has grown faster than other areas of the economy over the last few years; a banking reform law approved in 1997 broadened the scope of permissible foreign activity for Chilean banks. The Chilean government implemented a further liberalization of capital markets in 2001. Chileans have enjoyed the recent introduction of new financial tools such as home equity loans, currency futures and options, factoring, leasing, and debit cards. The introduction of these new products has been accompanied by increased use of traditional instruments such as loans and credit cards. Chile's private pension system, with assets worth roughly $54 billion in late 2004, has provided an important source of investment capital for the capital market. Chile maintains one of the best credit ratings (Standard & Poor's A+) of countries in Latin America. There are three main ways Chilean firms raise funds abroad: bank loans, bond issue, and the selling of stock on U.S. markets through American Depository Receipts (ADR's). Nearly all of the funds raised go to finance investment. The government is paying off its foreign debt. The combined public and private foreign debt was roughly over 50% of GDP at the end of 2004—low by Latin American standards.

Defense

Standard & Poor's Chile's Armed Forces are subject to civilian control exercised by the President through the Minister of Defense. Under the 1980 Constitution, the services enjoyed considerable autonomy, and the President could not remove service commanders on his own authority. However, reforms made in 2005 to the Constitution now give the President the right to remove the Commanders in Chief of the Armed Forces.

Army

The commander in chief of the Chilean Army is Maj. Gen. Juan Emilio Cheyre. The Chilean Army is 45,000 strong and is organized with an Army headquarters in Santiago, seven divisions throughout its territory, an Air Brigade in Rancagua, and a Special Forces Command in Colina. The Chilean Army is one of the most professional armies in the world and has one of the most technologically advanced armies in Latin America. It also operates Leopard I and AMX-30 main battle tanks.

Navy

Adm. Rodolfo Codina Díaz directs the 25,000-person Navy, including 5,000 Marines. Of the fleet of 29 surface vessels, only six are operational major combatants (destroyers and frigates). Those ships are based in Valparaíso. The Navy operates its own aircraft for transport and patrol; there are no Navy fighter or bomber aircraft. The Navy also operates three submarines based in Talcahuano.

Air Force (FACH)

Gen. Osvaldo Sarabia heads a force of 12,500. Air assets are distributed among five air brigades headquartered in Iquique, Antofagasta, Santiago, Puerto Montt, and Punta Arenas. The Air Force also operates an airbase on King George Island, Antarctica. The FACH will begin taking delivery of 10 U.S. F-16 aircraft in 2006.

Carabineros

After the military coup in September 1973, the Chilean national police (Carabineros) were incorporated into the Defense Ministry. With the return of democratic government, the police were placed under the operational control of the Interior Ministry but remained under the nominal control of the Defense Ministry. Gen. Alberto Cienfuegos is the head of the national police force of 30,000 men and women who are responsible for law enforcement, traffic management, narcotics suppression, border control, and counter-terrorism throughout Chile.

Foreign relations

Since its return to democracy in 1990, Chile has been an active participant in the international political arena. Chile completed a 2-year non-permanent position on the UN Security Council in January 2005. Chile is an active member of the UN family of agencies and participates in UN peacekeeping activities. Chile hosted the Defense Ministerial of the Americas in 2002 and the APEC summit and related meetings in 2004. Chile hosted the Community of Democracies ministerial in April 2005. An associate member of Mercosur and a full member of APEC, Chile and has been an important actor on international economic issues and hemispheric free trade. The Chilean Government has diplomatic relations with most countries. It settled its territorial disputes with Argentina during the 1990s. Chile and Bolivia severed diplomatic ties in 1978 over Bolivia's desire to reacquire territory it lost to Chile in 1879-83 War of the Pacific. The two countries maintain consular relations.

Demographics

War of the Pacific Unlike some of its South American neighbours, Chile is a relatively homogenous country. Around 95% of Chileans descend from early Spanish colonists, with the overwhelming part also possessing Native American ancestry in varying degrees - thus deeming the population majority as mestizo. During the colonial period, Spain found it necessary to maintain a continual influx of soldiers to protect its distant American colonies. Spaniards arrived from all regions of Spain, including: Andalucia, Extremadura and the Basque country, and many of them ended up settling in Chile. The combination of an economy based on temperate-zone agriculture, Amerindian resistance to Spanish occupation, and a continuous influx of Spaniards from the mid-sixteenth century to the end of the colonial period defined the main body of Chile's mestizo majority population to one where the average Spanish input is greater than in neighbouring Andean mestizo populations. People of relatively unmixed Spanish ancestry are not uncommon. Those of unmixed European ancestry are estimated between 5 to 10 percent. People that self-identify solely as members of any of the country's many indigenous groups number around 700,000 individuals, or 5% of the country's total population. Of that 700,000, around 80% are Mapuche that reside mainly in the south-central area of the country. Aymara and Quechua-speaking populations live along the northern border with Peru and Bolivia. There are also around 5,000 polynesian people who are indigenous to the Chilean territory of Easter Island (Rapanui) in the Pacific. Chileans descended from non-Spanish European nationalities are not very numerous, and they include a small but influential number of descendants of Irish immigrants which arrived in Chile during the Spanish colonial period, descendants of English immigrants (mainly merchants and sailors). A small scale government-sponsored immigration from Germany began in 1848, and in time, changed the cultural makeup of the southern provinces of Valdivia, Llanquihue, and Osorno, which still show a strong German influence. Other historically significant immigrant groups include people of Italian ancestry (Valparaíso Region) , Croatian (Antofagasta and Punta Arenas), French, Polish and peoples from Middle Eastern backgrounds (including the second largest Palestinian colony outside of the Middle East). In the last decade there has been an influx of Koreans who settled in small sections of Santiago. In recent years, the difficult economic situation in neighbouring Peru and Argentina has resulted in work-related trans-Andean migration to Chile.

Culture

Northern Chile was an important center of culture in the medieval and early modern Inca empire. Afterwards, their culture was dominated by the Spanish during the Colonial and early Republican period. Other European influences, primarily English and French, began in the 19th century and have continued until today, as in other Western societies. The national dance is the cueca. Another form of traditional Chilean song, though not a dance, is the tonada. Arising from music imported by the Spanish colonists, it is distinguished from the cueca by an intermediate melodic section and a more prominent melody. In the mid-1960s native musical forms were revitalized by the Parra family with the Nueva Canción Chilena, which was associated with political activists and reformers. Chileans call their country País de Poetas which means land of poets.

National symbols

Nueva Canción Chilena The national flower is the copihue (Lapageria rosea, Chilean bellflower), which grows in the woods of southern Chile. copihue The coat of arms depicts the two national animals: the condor (Vultur gryphus, a very large bird that lives in the mountains) and the huemul (Hippocamelus bisulcus, an endangered white tail deer). It also has the legend Por la razón o la fuerza (By right or might or By reason or by force).

Miscellaneous topics

- Communications in Chile
- Elections in Chile
- Foreign relations of Chile
- Holidays in Chile
- List of Chilean companies
- List of Chileans
- List of Chilean television channels
- Transportation in Chile
- U.S. intervention in Chile
- Chilean pharmaceutical policy

International rankings

Overall

- The Economist: [http://www.economist.com/theworldin/international/displayStory.cfm?story_id=3372495&d=2005 The World in 2005 - Worldwide quality-of-life index, 2005], ranked 31 out of 111 countries (first in Latin America)
- UNDP: Human Development Index [http://hdr.undp.org/reports/global/2005/ 2005], ranked 37 out of 177 countries (second in Latin America after Argentina)

Economy

- Heritage Foundation/The Wall Street Journal: [http://www.heritage.org/research/features/index/ 2005] Index of Economic Freedom, ranked 11 out of 155 countries (first in Latin America)
- IMD International: [http://www01.imd.ch/wcy/ World Competitiveness Yearbook 2005], ranked 19 out of 60 economies (countries and regions) (first in Latin America)
- Fraser Institute: Economic Freedom of the World: [http://www.freetheworld.com/ 2005 Annual Report], ranked 20 out of 127 countries (tied with Belgium, Costa Rica and Hungary) (first in Latin America)
- World Economic Forum: [http://www.weforum.org/site/homepublic.nsf/Content/Global+Competitiveness+Programme%5CGlobal+Competitiveness+Report Global Competitiveness Report 2005-2006 - Growth Competitiveness Index], ranked 23 out of 117 countries (first in Latin America)
- World Bank: [http://web.worldbank.org/WBSITE/EXTERNAL/NEWS/0,,contentMDK:20643669~pagePK:34370~piPK:34424~theSitePK:4607,00.html Where is the Wealth of Nations? (2005) - Total wealth per capita], ranked 32 out of 118 countries (fourth in Latin America after Argentina, Uruguay and Brazil)

Other

- Freedom House: [http://www.freedomhouse.org/research/survey2005.htm Freedom in the World 2005], average score: 1 (Free) (Costa Rica and Uruguay are the only two other Latin American countries with the highest score)
- Brown University: [http://www.brown.edu/Administration/News_Bureau/2005-06/05-024.html Fifth Annual Global E-Government Study (2005)], ranked 13 out of 198 countries (first in Latin America)
- Save the Children: [http://www.savethechildren.org/mothers/report_2005/ State of the World's Mothers 2005], ranked 17 out of 110 countries (tied with Argentina) (third in Latin America after Costa Rica and Cuba)
- Transparency International: [http://ww1.transparency.org/cpi/2005/cpi2005_infocus.html Corruption Perceptions Index 2005], ranked 21 out of 159 countries (tied with Japan) (first in Latin America)
- A.T. Kearney/Foreign Policy Magazine: [http://www.atkearney.com/main.taf?p=5,4,1,116 Globalization Index 2005], ranked 34 out of 62 countries (second in Latin America after Panama)
- World Economic Forum: [http://www.weforum.org/site/homepublic.nsf/Content/Global+Competitiveness+Programme%5CGlobal+Information+Technology+Report Global Information Technology Report 2004-2005 - Networked Readiness Index], ranked 35 out of 104 countries (first in Latin America)
- Yale University/Columbia University: [http://www.yale.edu/esi/ 2005 Environmental Sustainability Index], ranked 42 out of 146 countries (ninth in Latin America after Uruguay, Argentina, Brazil, Peru, Paraguay, Costa Rica, Bolivia, Colombia and Panama)
- Reporters without borders: [http://www.rsf.org/rubrique.php3?id_rubrique=554 Worldwide press freedom index 2005], ranked 50 out of 167 countries (fifth in Latin America after El Salvador, Costa Rica, Bolivia and Uruguay)

References

- [http://www.state.gov/r/pa/ei/bgn/1981.htm Bureau of Western Hemisphere Affairs], United States Department of State, April 2005
- [http://lcweb2.loc.gov/frd/cs/cltoc.html Library of Congress country profile]
- [http://www.cia.gov/cia/publications/factbook/geos/ci.html The (CIA) World Factbook: Chile]

External links

State-related resources

- [http://www.gobiernodechile.cl/ Gobierno] - Government ([http://www.chileangovernment.cl/ English version])
- [http://www.presidencia.cl/ Presidencia] - Presidency ([http://www.presidencyofchile.cl/ English version])
- [http://www.interior.cl/ Ministerio del Interior] - Interior Ministry
- [http://www.minrel.cl/ Ministerio de Relaciones Exteriores] - Ministry of Foreign Affairs
- [http://www.congreso.cl/ Congreso Nacional] - National Congress
- [http://www.senado.cl/ Senado] - Senate
- [http://www.camara.cl/ Cámara de Diputados] - Chamber of Deputies
- [http://www.bcn.cl/ Biblioteca del Congreso Nacional] - Library of National Congress
- [http://www.poderjudicial.cl/ Poder Judicial] - Judiciary

General information

- [http://www.chilephoto.cl/cgi-bin/chilephoto/chilephoto.cgi Pictures]
- [http://www1.lanic.utexas.edu/la/chile/ Several links compiled by LANIC]
-
- [http://www.chilebosque.cl Chilean native flora species] Category:South American countries zh-min-nan:Chile ko:칠레 ms:Chile ja:チリ simple:Chile th:ประเทศชิลี fiu-vro:Tsiili

Sumatra

Sumatra (also spelled Sumatara and Sumatera) is the sixth largest island of the world (approximately 470,000 km²) and is the largest part of Indonesia.

Geography

The longest axis of the island runs approximately northwest - southeast, crossing the equator near the center. The interior of the island is dominated by two geographical regions: the Barisan Mountains in the west and swampy plains in the east. To the southeast is Java, separated by the Sunda Strait. To the north is the Malay Peninsula, separated by the Straits of Malacca. To the east is Borneo, across the Karimata Strait. West of the island is the Indian Ocean. The backbone of the island is the Barisan mountains chain. The volcanic activity of this region endowed the region with fertile land and beautiful sceneries, for instance around the Lake Toba. It also contains deposits of coal and gold. To the east, big rivers carry silt from the mountain, forming the vast lowland interspersed by swamps. Even if mostly unsuitable for farming, the area is currently of great economic importance for Indonesia. It produces oil "from above the soil and underneath", the palm oil and petroleum. Most of Sumatra used to be covered by tropical rainforest, home to species such as orangutans, tapirs, and Sumatran tigers, and some unique plants like the Rafflesia. Unfortunately, economic development coupled with corruption and illegal logging has severely threatened its existence. Conservation areas have not been spared from destruction, either. See also: Islands of Indonesia, Riau islands

History

An ancient name for Sumatra was Swarna Dwipa, (Sanskrit for Isle of Gold), apparently based on the fact that mines in the Sumatran highlands were exporting gold from fairly early times. With its location in the India-China sea trade route, several trading towns flourished, especially in the eastern coast, and were influenced by Indian religions. The most notable of these were the Srivijaya and the Sumudra。Srivijaya was a Buddhist monarchy centered in what is now Palembang. Dominating the region through trade and conquest throughout the 7th-9th century, the kingdom helped spread the Malay culture throughout Sumatra, Malay Peninsula, and western Borneo. The empire was thalassocratic, a maritime power that extended its influence from island to island. Srivijaya influence waned in the 11th century. The island was then subject to conquests from Javanese kingdoms, first Singhasari and subsequently Majapahit. At the same time, Islam made its way to Sumatra, spreading through contacts with Arabs and Indian traders. By the late 13th century, the monarch of Samudra kingdom (now in Aceh) had converted to Islam. Ibn Battuta, who visited the kingdom during his journey, pronounced the kingdom "Sumatra", hence the name of the island. Samudra was succeeded by the powerful Aceh Sultanate, which survived to the 20th century. With the coming of the Dutch, the many Sumatran princely states gradually fell under their control. Aceh, in the north, was the major obstacle, as the Dutch were involved in the long and costly Aceh War (1870-1905). On 26 December 2004, the western coast and islands of Sumatra, particularly Aceh province, were devastated by a nearly 15 metre high tsunami following the 9.0-magnitude Indian Ocean earthquake. The death toll surpassed 170,000 in Indonesia alone, primarily in Aceh. In 2005 there was an 8.7 magnitude aftershock of the previous earthquake in December 2004. See 2005 Sumatran Earthquake.

Administration

2005 Sumatran Earthquake The administrative regions of Sumatra (or the smaller islands nearby) are:
- Aceh
- Bangka-Belitung
- Bengkulu
- Jambi
- Lampung
- Riau- capital: Pekanbaru
- Sumatera Barat (West Sumatra) - capital: Padang
- Sumatera Selatan (South Sumatra) - capital: Palembang
- Sumatera Utara (North Sumatra) - capital: Medan

Demographics

Sumatra is not very heavily populated, about 85 people per sq.km (with more than 40 million people in an area the size of Germany). The most populous regions includes most of Sumatra Utara and central highland in Sumatra Barat, while the major urban centre are Medan and Palembang. The people are of Malay stock composed of many different tribes, speaking 52 different languages. Most of these groups, however, share many similar traditions and the different tongues are closely related. Malay-speaking people dominate the eastern coast, while people in the southern and central interior speak languages related to Malay, such as Lampung and Minangkabau. The highland of northern Sumatra is inhabited by the Bataks, while the northernmost coast is dominated by Acehs. Ethnic Chinese minorities are also present in urban centers. A majority of people in Sumatra are Muslims. Most central Bataks, meanwhile, are Protestant Christians - the religion was spread by the Dutch. The rest follow Hinduism, Buddhism, Catholicism, and Chinese traditional beliefs.

Flora and fauna

- Sumatran Pine
- Rafflesia
- Orangutan
- Orang Pendek

External links

- http://indahnesia.com/indonesia.php?code=SUBHIS: offers a brief history of the Minangkabau region (West Sumatra)
- Category:Islands of Indonesia zh-min-nan:Sumatra ko:수마트라 섬 ms:Sumatera ja:スマトラ島 th:เกาะสุมาตรา

Arctic Ocean

The Arctic Ocean, located mostly in the north polar region, is the smallest of the world's five oceans, and the shallowest. Even though IHO recognizes it as an ocean, oceanographers may call it the Arctic Mediterranean Sea or simply the Arctic Sea, classifying it as one of the mediterranean seas of the Atlantic Ocean.

Geography

Atlantic Ocean The Arctic Ocean occupies a roughly circular basin and covers an area of about 14,090,000 km² (5,440,000 mi²), slightly less than 1.5 times the size of the US. The coastline length is 45,389 km. Nearly landlocked, it is surrounded by the land masses of Eurasia, North America, Greenland, and a number of islands. It includes Baffin Bay, Barents Sea, Beaufort Sea, Chukchi Sea, East Siberian Sea, Greenland Sea, Hudson Bay, Hudson Strait, Kara Sea, Laptev Sea, White Sea and other tributary bodies of water. It is connected to the Pacific Ocean by the Bering Strait and to the Atlantic Ocean through the Greenland Sea. An underwater ocean ridge, the Lomonosov Ridge, divides the Arctic Ocean into two basins: the Eurasian, or Nansen, Basin, which is between 4,000 and 4,500 m (13,000 and 15,000 ft) deep, and the North American, or Hyperborean, Basin, which is about 4,000 m deep. The topography of the ocean bottom is marked by fault-block ridges, plains of the abyssal zone, ocean deeps, and basins. The average depth of the Arctic Ocean is 1,038 m (3,407 ft), in part due to the large extent of continental shelf extant on the Eurasian side [http://www.marianatrench.com/mariana_trench-oceanography.htm]. continental shelfs.]] The greatest inflow of water comes from the Atlantic by way of the Norwegian Current, which then flows along the Eurasian coast. Water also enters from the Pacific via the Bering Strait. The East Greenland Current carries the major outflow. Temperature and salinity vary seasonally as the ice cover melts and freezes. Ice covers most of the ocean surface year-round, causing subfreezing temperatures much of the time. The Arctic is a major source of very cold air that inevitably moves toward the equator, meeting with warmer air in the middle latitudes and causing rain and snow. Little marine life exists where the ocean surface is covered with ice throughout the year. Marine life abounds in open areas, especially the more southerly waters. The ocean's major ports are the Russian cities of Murmansk and Arkhangelsk (Archangel). The Arctic Ocean is important as the shortest air route between the Pacific coast of North America and Europe overflies it. Major chokepoint is the southern Chukchi Sea (northern access to the Pacific Ocean via the Bering Strait); strategic location between North America and Russia; shortest marine link between the extremes of eastern and western Russia; floating research stations operated by the US and Russia; maximum snow cover in March or April about 20 to 50 centimeters over the frozen ocean; snow cover lasts about 10 months. Geographic coordinates:

Climate

Arkhangelsk Arkhangelsk Polar climate characterized by persistent cold and relatively narrow annual temperature ranges; winters characterized by continuous darkness, cold and stable weather conditions, and clear skies; summers characterized by continuous daylight, damp and foggy weather, and weak cyclones with rain or snow. There is considerable seasonal variation in how much pack ice covers the Arctic Ocean.

Elevation extremes

- lowest point: Fram Basin −4,665 m (according to [http://www.marianatrench.com/mariana_trench-oceanography.htm], the Arctic Ocean's Eurasian Basin deepest point is at −5,450 m (17,881 ft))
- highest point: sea level 0 m

Natural resources

Oil and gas fields, placer deposits, polymetallic nodules, sand and gravel aggregates, fish, marine mammals (seals and whales). The political dead zone near the center of the sea is also at the center of a mounting dispute between the United States, Russia, Canada, Norway, and Denmark. It is considered significant because of its potential to contain as much as or more than a quarter of the world's oil and gas resources, the tapping of which could greatly alter the flow of the global energy market. [http://news.bbc.co.uk/2/hi/business/4354036.stm#map The Arctic's New Gold Rush - BBC]

Natural hazards

Ice islands occasionally break away from northern Ellesmere Island; icebergs calved from glaciers in western Greenland and extreme northeastern Canada; permafrost on islands; virtually ice locked from October to June; ships subject to superstructure icing from October to May.

Environment - current issues

Endangered marine species include walruses and whales; fragile ecosystem slow to change and slow to recover from disruptions or damage; thinning polar icepack; seasonal hole in ozone layer over the North Pole. Reduction of the area of Arctic sea ice will have an effect on the planet's albedo, thus possibly affecting global warming. Many scientists are presently concerned that warming temperatures in the Arctic may cause large amounts of fresh, Arctic Ocean meltwater to enter the North Atlantic, possibly disrupting global ocean current patterns. Potentially severe changes in the Earth's climate might then ensue.

Ports and harbors

ocean current patterns Churchill, Manitoba (Canada), Inuvik, (Canada) Prudhoe Bay, (US) Barrow, (US) Pevek, (Russia) Tiksi, (Russia), Dikson (Russia), Dudinka, (Russia), Murmansk (Russia), Arkhangelsk (Russia) Kirkenes, (Norway) Vardø, (Norway)

Transportation - note

Sparse network of air, ocean, river, and land routes; the Northwest Passage (North America) and Northern Sea Route (Eurasia) are important seasonal waterways.

Exploration

The first surface crossing of the Arctic Ocean was led by Wally Herbert in 1969, in a dogsled expedition from Alaska to Svalbard with air support. See also Northwest Passage, Open Polar Sea.

References

Bibliography:
- Neatby, Leslie H., Discovery in Russian and Siberian Waters 1973 ISBN 0821401246
- Ray, L., and Stonehouse, B., eds., The Arctic Ocean 1982 ISBN 0333310179
- Thorén, Ragnar V. A., Picture Atlas of the Arctic 1969 ISBN 0821401246 Based on public domain text by US Naval Oceanographer: http://oceanographer.navy.mil/arctic.html

External links

- [http://www.arctic-council.org Arctic Council]
- [http://www.northernforum.org The Northern Forum]
- [http://vitalgraphics.grida.no/arcticmap Arctic Environmental Atlas] Interactive map of the Greater Arctic, including shaded relief and bathymetry of the Arctic Ocean.
- [http://www.arctic.noaa.gov NOAA Arctic Theme Page] Comprehensive Arctic Resource with data, photos, maps, essays on key Arctic issues, and much more.
- [http://dapper.pmel.noaa.gov/dchart/ NOAA In-situ Ocean Data Viewer] Plot and download ocean observations
- [http://www.unaami.noaa.gov Arctic time series: The Unaami Data collection] Viewable interdisciplinary, diverse collection of Arctic variables from different geographic regions and data types.
- [http://www.arctic.noaa.gov/gallery_np.html NOAA North Pole Web Cam] Images from Web Cams deployed in Spring on an ice floe in the middle of the Arctic Ocean.
- [http://www.arctic.noaa.gov/gallery_np_weatherdata.html NOAA Near-realtime North Pole Weather Data] Data from instruments deployed on an ice floe in the middle of the Arctic Ocean.
- [http://www.wired.com/news/technology/0,1282,63980,00.html Search for Arctic Life Heats Up by Stephen Leahy] Category:Oceans Category:Seas Category:Arctic zh-min-nan:Pak-ke̍k-iûⁿ ko:북극해 ja:北極海 simple:Arctic Ocean th:มหาสมุทรอาร์กติก

Kilometer

A kilometre (American spelling: kilometer), symbol: km is a unit of length in the metric system equal to 1000 metres (from the Greek words χίλια (khilia) = thousand and μέτρο (metro) = count/measure). It is approximately equal to 0.621 miles, 1094 yards or 3281 feet. Slang terms for kilometre include "klick" (sometimes spelt "click" or "klik") and "kay" (or "k"). All these slang terms can also refer to kilometres per hour.

Metric system

:Main articles: Metric system and Metre Like the kilometre, all units of length in the metric system are based on the metre, by adding an SI prefix that stands for a power of ten, such as hecto for one hundred to form hectometre (= 0.1 kilometre) or mega for one million to form megametre (= 1,000 kilometre). The metre is not only the basis for all units of length in the metric system, but also of units of area (the square metre) and volume (the cubic metre). This extends to the kilometre, so one can have square and cubic kilometres. Unicode has symbols for "km" (㎞), for square kilometre (㎢) and for cubic kilometre (㎦); however, they are useful only in CJK texts, where they are equal in size to one Chinese character.

Pronunciation

In theory, the pronunciation of the word kilometre should have the stress placed on the first syllable, in line with other metric prefixes (as in kilogram, kilojoule and, analogous, kilobyte). However, pronunciation with the stress on the second syllable is usual in English.

Sunda Shelf

Geologically, the Sunda Shelf is an extension of the continental shelf of Southeast Asia, covered during interglacials by the South China Sea, which isolates as islands Borneo, Sumatra Java and smaller islands. During Glacial periods, the sea level falls, and great expanses of the Sunda Shelf are exposed as a marshy plain. The seas and bays that cover the Sunda Shelf are less than 100 m deep. Steep undersea gradients separate the Sunda Shelf from the Philippines, Sulawesi and the Lesser Sunda Islands, where the dividing line, passing between Bali and Lombok, is marked by a major discontinuity in fauna that is known as the Wallace Line from Alfred Russel Wallace, the biologist who first recognized it in the 19th century. Category:Geography of Asia

Borneo

]] Borneo (politically divided between Indonesia, Malaysia and Brunei) is the third largest island in the world. It has an area of 743,330 km² (287,000 mi²), and is located at the centre of the Malay archipelago and Indonesia. Borneo is considered part of the geographic region of Southeast Asia.

Geography

Borneo is surrounded by the South China Sea to the north and northwest, the Sulu Sea to the northeast, the Celebes Sea and the Makassar Strait to the east, and the Java S