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Capstone

Capstone

The capstone is the highest rock or mount of a structure. Often they have "doorways", the capstone would lock or wedge the rest of the rocks tightly together, giving strength, much like a wedge, when driven into a tight spot. The reverse side of a dollar bill denotes a single "eye" as the capstone of the pyramid, (also called a Pyramidion-stone). In an arch, the capstone, or sometimes called the keystone, holds the arch together. An American stonehenge Georgia Guidestones has a capstone, atop all the other languages/stones, written in ancient languages. On each side of the capstone a different language is written including Sanskrit, Classical Greek, Egyptian Hieroglyphs and Babylonian Cuneiform. These languages signify the past as the parent of the modern age.

Seven Ancient Wonders - The Book

In a book by Matthew Reilly, Seven Ancient Wonders, the Capstone to the Great Pyrimid features magical powers. In the book, the capstone was broken up into seven pieces that were spread around the world, hidden in the Seven Ancient Wonders (hence the name of the book). Note: this book is entirley fiction.

Rock (geology)

, plutonic, metamorphic rock types of North America. ]] Rock is a naturally occurring aggregate of minerals and/or mineraloids. Rocks are classified by mineral and chemical composition; the texture of the constituent particles; and also by the processes that formed them. These indicators separate rocks into igneous, sedimentary, and metamorphic. Igneous rocks are formed from molten magma, and are divided into two main categories: Plutonic rock and Volcanic rock. Plutonic rocks result when the magma cools and crystallises slowly within the Earth's crust, while Volcanic rocks result from the magma reaching the surface either as lava or fragmental ejecta. Sedimentary rocks are formed by deposition of either detrital or organic matter, or chemical precipitates (evaporites), followed by compaction of the particulate matter and cementation. The latter can occur at or near the earth's surface, especially in the case of carbonate-rich sediments. Metamorphic rocks are formed by subjecting any rock type (including previously-formed metamorphic rock) to different temperature and pressure conditions than those in which the original rock was formed. These temperatures and pressures are always higher than those at the earth's surface, and must be sufficiently high so as to change the original minerals into other mineral types or else into other forms of the same minerals (e.g. by recrystallisation). The transformation of one rock type to another is described by the geological model called the rock cycle. The Earth's crust (including the lithosphere) and mantle are formed of rock.

External links

- [http://www.geol.lsu.edu/henry/Geology3041/2IgneousClassify/IgneousClassFlow.htm Classification of Igneous Rocks] Category:Geology Category:Rocks ja:岩石 ms:Batu th:หิน

Mount

The word mount (from the Latin mons, 'mountain' or hill) has many meanings:
- A mount is a Riding animal, i.e. a (usually domesticated) animal intending for riding— mainly horse and other equines, camel, elephant or garuda, for example.
- The related verb to mount means to sit astride such an animal.
- To mount is to climb or to stand atop something. In this sense, it can also refer euphemistically to coitus, especially between animals.
- A mount is a point where additional equipment, such as a weapon, camera, winch and telescope can be attached to a vehicle so that the vehicle itself supports the weight of the equipment, rather than the operator. See also turret, hard point and pintel.
- A mount is a favourable position in grappling, sitting on the adversary's chest.
- A mount in gymnastics is the maneuver of going from the ground onto a gymnastic apparatus, such as the balance beam or parallel bars.
- "Mount" may be short for mountain, especially in names such as Mount Ararat.
- To mount a file system, in computer science, is to make it ready for use by the operating system, typically by reading certain index data structures from storage into memory ahead of time. Devices may be mounted automatically (generally called automounting) depending on the operating system; see file system.

Strength

Strength may refer to
- Physical strength of organisms' means (especially the muscles of most metazoa) of locomotion and movement
- Strength of materials in physics, engineering and materials science
- Strength is a rap compilation presented by Asiatic Warriors
- Strength (VIII) is a Major Arcana card in Tarot.
- The word strengths is one of the longest English words with one syllable.
- Strength, or one of its synonyms, is the most common character attribute seen in role-playing games.
- Strong cryptography is a term used for forms of cryptography that are extremely resistent to cryptanalysis.
- Strength of the mind, determined and sure
- the band Strength based in Portland, Oregon, see Strength (band).

Wedge

The term wedge can refer to any one of the following things:
- In mechanics, a simple machine used to separate two objects, or portions of objects, through the application of force is often called a wedge.
- In mathematics, the wedge product or the wedge sum.
- In science fiction, Wedge Antilles (Star Wars). See also Wedge-type characters.
- In phonetics, wedge is a name commonly used for the open-mid back unrounded vowel.
- Among golf clubs, a wedge is a specialized type of iron.
- In U.S. geography, the Wedge is part of the border between Delaware and Pennsylvania.
- In auto racing, an adjustment to make a car handle better. Often to fix a looseness or tightness situation. Made through holes in the rear window of the racecar, using a wrench.
- In Westchester County, New York, a hero sandwich, submarine sandwich, or hoagie is called a wedge. Category:Disambiguation

Dollar bill

A dollar bill can be of various kinds of currency:
- Federal Reserve dollar bill (modern U.S. currency)
- United States note (historic U.S. currency)
- The actual U.S. one dollar bill
- Silver certificate (historic U.S. currency)
- Gold certificate (historic U.S. currency) Other countries, like Canada, Australia, and New Zealand used to have dollar bills, now replaced by coins. See also dollar.

Pyramid

For other versions including architectural Pyramids, see Pyramid (disambiguation).
Geometry
Pyramid (disambiguation) An n-sided pyramid is a polyhedron formed by connecting an n-sided polygonal base and a point, called the apex, by n triangular faces (n≥3). See Pyramid (geometry)
Structures
:See also List of ancient pyramids by country Pyramids are among the largest man-made constructions.

Ancient monuments

The oldest pyramid is that of Hellinikon in Greece, dating from 2,720 BC. There are more than 16 pyramids spread all over Greece. (See [http://www.ancientgr.com/Unknown_Hellenic_History/Eng/HELLENIC_PYRAMIDS.htm Hellenic Pyramids].) Hellinikon Pyramid-shaped structures were built by many ancient peoples. The most famous are the Egyptian pyramids — huge pyramids built of brick or stone, used as tombs for pharaohs. The Great Pyramid of Giza is the largest in Egypt and tallest in the world. It is one of the Seven Wonders of the World, and the only one of the seven to survive into modern times. The ancient Egyptians smoothed the faces of their pyramids with gold and polished white limestone, though many of the stones used for the purpose have fallen out over the centuries. To the south of Egypt the Nubians also built pyramids. They built far more than the Egyptians, but they are much smaller. The Nubian pyramids were constructed at a much steeper angle than Egyptian ones and were not tombs, but monuments to dead kings. Pyramids were built in Nubia up until the AD 300s. The Mesopotamians also built step pyramids, or ziggurats. In ancient times these were brightly painted. Since they were constructed of mud-brick, little remains of them. The biblical Tower of Babel is believed to be a Babylonian ziggurat. A number of Mesoamerican cultures also built pyramid-shaped structures. Mesoamerican pyramids were also usually stepped, with temples on top, more similar to the Mesopotamian ziggurat than the Egyptian pyramid. The largest pyramid by volume is the Great Pyramid of Cholula, in the Mexican state of Puebla. There are other pyramid-shaped ancient monuments found in parts of Asia. Pyramids were also found in Greece. One of these pyramids in Greece is older than the pyramid of Cheops, as it was dated to 2720 BC. There is a pyramid in ancient Rome. The 27-meter-high pyramid of Gaius Cestius was built by the end of the first century BC and still exists today, close to the Porta San Paolo.

First pyramid in Europe?

In October 2005, archaeologist Semir Osmanagić announced that a hill near the Bosnian town of Visoko conceals a pyramid 100 metres high and perhaps 12,000 years old [http://dino.avdibeg.dk/blog/2005/10/pyramid-found-in-heart-of-bosnia.html],[http://news.bbc.co.uk/1/hi/world/europe/4377290.stm]. If confirmed, this would be the oldest discovery of a pyramid in Europe.[http://news.yahoo.com/s/ap/20051204/ap_on_sc/apn_pyramid_mystery]

Modern pyramids

An example of a modern pyramid can be found in Paris, France, in front of the Louvre Museum. The 32-story Pyramid Arena in Memphis, Tennessee (built 1991) was the home court for the University of Memphis men's basketball program, and the National Basketball Association's Memphis Grizzlies until 2004. The Walter Pyramid, home of the basketball and volleyball teams of the California State University, Long Beach, campus in California, United States, is an 18-story-tall blue pyramid. The Luxor Hotel in Las Vegas, United States, is a 30-story pyramid.

Hierarchical structure

The hierarchical structures of some organizations are sometimes described as pyramids. This often includes sports league systems.

Human pyramid

This is a stunt, performed by circus artists -sometimes even doing other tricks such as juggling while up there- or less perfectly by amateurs (often for the fun of failing and falling), whereby participants form a pyramid of layers of persons, each standing (or supporting in another way, e.g. kneeling) on two others one level lower, one half a position to the right and the other to the left. league system
- During the Hindu festival Krishna Janmaashtami, young men form human pyramids to reach pots filled with curd and butter and suspended high above the ground as part of the Dahi-Handi ritual.
- Human pyramids are often formed to reach for the bun during the Chinese Bun Festival.
- It is also used in bonding, e.g. as part of a North American college fraternity hazing ritual, also in a variation called a spanking pyramid, also suitable as a collective punishment, in which the pledges, often divested, are paddled on the conveniently protruded posterior.

Arts and Media

hazing hazing
- Game show Pyramid is the name of a game show currently in syndication.
- Novel Pyramids is a Discworld novel by Terry Pratchett.
- Album Pyramid is a concept album by The Alan Parsons Project, released in 1978.
- American Rock-n-Roll Band The Pyramids played instrumental surf music out of Long Beach, CA in the early 60's
- Magazine Pyramid is an online magazine publishing role-playing and other game articles, published by Steve Jackson Games.
- Card Game Pyramids a single player card game.
- Fictional sport Pyramid is a team sport played professionally and recreationally by humans in the television drama Battlestar Galactica (2003).

Confidence game

A pyramid scheme is a phony business, similar to a chain letter, that involves the exchange of money primarily for enrolling other people into the scheme, promising a multiple return as long as the pyramid keeps growing - which it inevitably stops doing rather soon, so only the first participants are likely to make a profit.

Arch

An arch is a curved structure capable of spanning a space while supporting significant weight (e.g. a doorway in a stone wall). The arch was developed in Mesopotamia, Assyria, Egypt and Etruria. It was later refined in Ancient Rome. The arch became an important technique in cathedral building and is still used today in some modern structures as for example in bridges.

Technical aspects

The arch is significant because, in theory at least, it provides a structure which eliminates tensile stresses in spanning an open space. All the forces are resolved into compressive stresses. This is useful because several of the available building materials such as stone, cast iron and concrete can strongly resist compression but are very weak when tension, shear or torsional stress is applied to them. By using the arch configuration, significant spans can be achieved. This same principle holds when the force acting on the arch is not vertical such as in spanning a doorway, but horizontal, such as in arched retaining walls or dams. Even when using concrete, where the structure may be monolithic, the principle of the arch is used so as to benefit from the concrete's strength in resisting compressive stress. Where any other form of stress is raised, it has to be resisted by carefully placed reinforcement rods or fibres. (See Arch bridge.) The following gallery shows examples of arch forms displayed in roughly the order in which they were developed. Image:Treledsbåge.png|Triangular arch Image:Rundbåge.png|Round arch or Semi-circular arch Image:Segmentbåge.png|Segmental arch Image:Stigande båge.png|Unequal round arch or Rampant round arch Image:Lansettbåge.png|Lancet arch Image:Spetsbåge.png|Equilateral pointed arch Image:Skulderbåge.png|Shouldered flat arch Image:Trepassbåge.png|Three-foiled cusped arch Image:Hästskobåge.png|Horseshoe arch Image:Korgbåge.png|Three-centred arch Image:Ellipsbåge.png|Elliptical arch Image:Draperibåge.png|Inflexed arch Image:Kölbåge.png|Ogee arch Image:Karnisbåge.png|Reverse ogee arch Image:Tudorbåge.png|Tudor arch Image:Parabelbåge.png|Catenary or Parabolic arch Parabolic arch

Construction

An arch requires all of its elements to hold it together. This raises the interesting question of how an arch is actually constructed. One simple answer is to build a frame (historically, of wood) which exactly follows the form of the underside of the arch. This is known as a centre or centring. The voussoirs are laid on it until the arch is complete and self-supporting. For an arch higher than head height, scaffolding would in any case be required by the builders, so the scaffolding can be combined with the arch support. Occasionally arches would fall down when the frame was removed if construction or planning had been incorrect. (The A85 bridge at Dalmally, Scotland suffered this fate on its first attempt, in the 1940s).

History

Arches were used by the Egyptian, Babylonian, Greek and Assyrian civilizations for underground structures such as drains and vaults, but the ancient Romans were the first to use them widely above ground although it is thought that Romans learned it from the Etruscans. The so-called Roman arch is semicircular, and built from an odd number of arch bricks (in modern architectural parlance, these are called voussoirs). The capstone or keystone is the topmost stone in the arch. This shape is the simplest to build, but not the strongest. There is a tendency for the sides to bulge outwards, which must be counteracted by an added weight of masonry to push them inwards. The semicircular arch can be flattened to make an elliptical arch. The horseshoe arch is based on the semicircular arch, but its lower ends are extended further round the circle until they start to converge. It was used in Spanish Visigothic architecture, Islamic architecture and mudéjar architecture, as in the Great Mosque of Damascus and in later Moorish buildings. It was used for decoration rather than for strength. The semicircular arch was followed in Europe by the pointed Gothic arch or ogive, whose centreline more closely followed the forces of compression and which was therefore stronger. This design had been used by the Assyrians as early as 722 BC. The parabolic and catenary arches are now known to be the theoretically strongest forms. The arch was used in some bridges in China since the Song dynasty. Song dynasty design.]]

Other types

A dome is a three-dimensional application of the arch. Igloos are notable early structures making use of domes. A special form of the arch is the triumphal arch, usually built to celebrate a victory in war. The most famous example of this is the Arc de Triomphe in Paris, France. Natural rock formations may also be referred to as 'arches'. These natural arches are formed by erosion rather than being carved or constructed by man. See Arches National Park for examples.

References

- pp. 27-8 Category:Architectural elements Category:Arch bridges ja:アーチ th:อาร์ช

United States

:For alternative meanings, see the disambiguation page for US, USA, United States, or American. The United States of America is a federal democratic republic situated primarily in central North America. It comprises 50 states and one federal district, and has several territories. It is also referred to, with varying formality, as the United States, the U.S., the U.S.A., the States, or simply and most commonly, America. The official founding date of the United States is July 4, 1776, when the Second Continental Congress—representing thirteen British colonies—adopted the Declaration of Independence. However, the structure of the government was profoundly changed in 1788, when the states replaced the Articles of Confederation with the United States Constitution. The date on which each of the fifty states adopted the Constitution is typically regarded as the date that state "entered the Union" (became part of the United States). Since the mid-20th century, following World War II, the United States has emerged as a dominant global influence in economic, political, military, scientific, technological, and cultural affairs.

Geography and climate

The United States shares land borders with Canada (to the north) and Mexico (to the south), and territorial water boundaries with Canada, Russia, the Bahamas, and numerous smaller nations. It is otherwise bounded by the Pacific Ocean and the Bering Sea, in the west; the Arctic Ocean, in the northernmost areas; and the Atlantic Ocean, the Gulf of Mexico, and the Caribbean Sea, in the eastern and southeastern areas. Forty-eight of the states are in the single region between Canada and Mexico; this group is referred to, with varying precision and formality, as the continental or contiguous United States, sometimes abbreviated CONUS, and as the Lower 48. Alaska, which is not included in the term contiguous United States, is at the northwestern end of North America, separated from the Lower 48 by Canada. The archipelago of Hawaii is in the Pacific Ocean. The capital city, Washington, District of Columbia is a federal district located on land donated by the state of Maryland. (Virginia also donated land, but it was returned in 1847.) The United States also has overseas territories with varying levels of independence and organization. When inland water is included in the total area, only Russia and Canada are larger than the United States; if inland water is excluded, China ranks third and the U.S. ranks fourth. The United States' total area is 3,718,711 square miles (9,631,418 km²), of which land makes up 3,537,438 square miles (9,161,923 km²) and water makes up 181,273 square miles (469,495 km²). The United States' landscape is one of the most varied among those of the world's nations: among its many features are temperate forestland and rolling hills, on the east coast; mangrove, in Florida; the Great Plains, in the center of the country; the Mississippi–Missouri river system; the Great Lakes, four of the five of which are shared with Canada; the Rocky Mountains, west of the Great Plains; deserts and temperate coastal zones, west of the Rocky Mountains; and temperate rain forests, in the Pacific northwest. Alaska's tundra, and the volcanic, tropical islands of Hawaii add to the geographic diversity. Hawaii The climate varies along with the landscape, from tropical in Hawaii and southern Florida to tundra in Alaska and atop some of the highest mountains. Most of the North and East experience a temperate continental climate, with warm summers and cold winters. Most of the South experiences a subtropical humid climate with mild winters and long, hot, humid summers. Rainfall decreases markedly from the humid forests of the Eastern Great Plains to the semi-arid shortgrass prairies on the high plains abutting the Rocky Mountains. Arid deserts, including the Mojave, extend through the lowlands and valleys of the southwest, from westernmost Texas to California and northward throughout much of Nevada. Some parts of California have a Mediterranean climate. Rainforests line the windward mountains of the Pacific Northwest from Oregon to Alaska.

History

American history started with the migration of people from Asia across the Bering land bridge approximately 12,000 years ago following large animals that they hunted into the Americas. These Native Americans left evidence of their presence in petroglyphs, burial mounds, and other artifacts. It is estimated that 2-9 million people lived in the territory now occupied by the U.S. before European contact, and the subsequent introduction of foreign diseases such as small pox that greatly diminished the native populations. Some advanced societies were the Anasazi of the southwest, who inhabited Chaco Canyon, and the Woodland Indians, who built Cahokia, located near present-day St Louis, a city with a population of 40,000 at its peak in AD 1200. Vikings first visited North America around 1000, but did not settle permanently. Following the discovery voyages of Christopher Columbus around 1492, other Europeans began to explore and settle there. During the 1500s and 1600s, the Spanish settled parts of the present-day Southwest and Florida, founding St. Augustine, Florida in 1565 and Santa Fe (in what is now New Mexico) in 1607. The first successful English settlement was at Jamestown, Virginia, also in 1607. Within the next two decades, several Dutch settlements, including New Amsterdam (the predecessor to New York City), were established in what are now the states of New York and New Jersey. In 1637, Sweden established a colony at Fort Christina (in what is now Delaware), but lost the settlement to the Dutch in 1655. This was followed by extensive British settlement of the east coast. The British colonists remained relatively undisturbed by their home country until after the French and Indian War, when France ceded Canada and the Great Lakes region to Britain. Britain then imposed taxes on the 13 colonies, widely regarded by the colonists as unfair because they were denied representation in the British Parliament. Tensions between Britain and the colonists increased, and the thirteen colonies eventually rebelled against British rule. British Parliament, George Washington (1789-1797).]] In 1776, the 13 colonies split from Great Britain and formed the United States, the world's first constitutional and democratic federal republic, after their Declaration of Independence of that year, and the Revolutionary War (1775 to 1783). The original political structure was a confederation in 1777, ratified in 1781 as the Articles of Confederation. After long debate, this was supplanted by the Constitution in 1789, forming a more centralized federal government. Prior to all these was the Albany Congress in 1754, in which a union was first seriously proposed. From early colonial times, there was a shortage of labor, which encouraged unfree labor, particularly indentured servitude and slavery. In the mid-19th century, a major division occurred in the United States over the issue of states' rights and the expansion of slavery. The northern states had become opposed to slavery, while the southern states saw it as necessary for the continued success of southern agriculture and wanted it expanded to the territories. Several federal laws were passed in an attempt to settle the dispute, including the Missouri Compromise and the Compromise of 1850. The dispute reached a crisis in 1861, when seven southern states seceded¹ from the Union and formed the Confederate States of America, leading to the Civil War. Soon after the war began, four more southern states seceded. During the war, Abraham Lincoln issued the Emancipation Proclamation, mandating the freedom of all slaves in states in rebellion, though full emancipation did not take place until after the end of the war in 1865, the dissolution of the Confederacy, and the Thirteenth Amendment took effect. The Civil War effectively ended the question of a state's right to secede, and is widely accepted as a major turning point after which the federal government became more powerful than state governments. Thirteenth Amendment). The title of the painting, from a 1726 poem by Bishop Berkeley, was a phrase often quoted in the era of Manifest Destiny, expressing a widely held belief that civilization had steadily moved westward throughout history. [http://americanart.si.edu/t2go/1lw/1931.6.1.html (more)] ]] During the 19th century, many new states were added to the original 13 as the nation expanded across the continent. Manifest Destiny was a philosophy that encouraged westward expansion in the United States. As the population of the Eastern states grew and as a steady increase of immigrants entered the country, settlers moved steadily westward across North America. In the process, the U.S. displaced most American Indian nations. This displacement of American Indians continues to be a matter of contention in the U.S. with many tribes attempting to assert their original claims to various lands. In some areas American Indian populations were reduced by foreign diseases contracted through contact with European settlers, and US settlers acquired those emptied lands. In other instances American Indians were removed from their traditional lands by force. Though some would say the U.S. was not a colonial power until the Spanish-American War when it acquired Puerto Rico, Guam and the Philippines, the dominion exercised over land in North America the United States claimed is essentially colonial. The Philippines became independent in 1946. During this period, the nation also became an industrial power. This continued into the 20th century, which has been termed "the American Century" because of the nation's overriding influence on the world. The US became a center for innovation and technological development; major technologies that America either developed or was greatly involved in improving include the telephone, television, computer, the Internet, nuclear weapons, nuclear power, aviation, and aeronautics. In addition to the Civil War, another major traumatic experience for the nation was the Great Depression (1929 to 1939). The nation has also taken part in several major foreign wars, including World War I and World War II (in both of which the US later joined the Allies). During the Cold War, the US was a major player in the Korean War and Vietnam War, and, along with the Soviet Union, was considered one of the world's two "superpowers". With the collapse of the Soviet Union, the US emerged as the world's leading economic and military power. Beginning in the 1990s, the United States became very involved in police actions and peacekeeping, including actions in Kosovo, Haiti, Somalia and Liberia, and the first Persian Gulf War driving Iraq out of Kuwait. After attacks on the World Trade Center and the Pentagon on September 11, 2001, the United States and other allied nations found themselves involved in what has come to be called the "War on Terrorism," which has primarily encompassed military actions in both Afghanistan and Iraq.

Government

Iraq of the United States.]]

Republic and suffrage

The United States is an example of a constitutional republic, with a government composed of and operating through a set of limited powers imposed by its design and enumerated in the United States Constitution. Specifically, the nation operates as a presidential democracy. There are three levels of government: federal, state, and local. Officials of each of these levels are either elected by eligible voters via secret ballot or appointed by other elected officials. Americans enjoy almost universal suffrage from the age of 18 regardless of race, sex, or wealth. There are some limits, however: felons are disenfranchised and in some states former felons are likewise. Furthermore, the national representation of territories and the federal district of Washington, DC in Congress is limited: residents of the District of Columbia are subject to federal laws and federal taxes but their only Congressional representative is a non-voting delegate.

Federal government

The federal government is the national government, comprising the Legislative Branch (led by Congress), the Executive Branch (led by the President), and the Judicial Branch (led by the Supreme Court). These three branches were designed to apply checks and balances on each other. The Constitution limits the powers of the federal government to defense, foreign affairs, the issuing and management of currency, the management of trade and relations between the states, and the protection of human rights. In addition to these explicitly stated powers, the federal government—with the assistance of the Supreme Court—has gradually extended these powers into such areas as welfare and education, on the basis of the "necessary and proper" clause of the Constitution.

The Congress

necessary and proper The Congress of the United States is the legislative branch of the federal government of the United States. It is bicameral, comprising the House of Representatives and the Senate. The House of Representatives consists of 435 members, each of whom represents a congressional district and serves for a two-year term. House seats are apportioned among the states by population; in contrast, each state has two Senators, regardless of population. There are a total of 100 senators, who serve six-year terms. The powers of Congress are limited to those enumerated in the Constitution; all other powers are reserved to the states and the people. The Constitution also includes the necessary-and-proper clause, which grants Congress the power to "make all laws which shall be necessary and proper for carrying into execution the foregoing powers."

The President

necessary-and-proper clause At the top level of the executive branch is the President of the United States. The President and Vice-President are elected as 'running mates' for four-year terms by the Electoral College, for which each state, as well as the District of Columbia, is allocated a number of seats based on its representation (or ostensible representation, in the case of D. C.) in both houses of Congress (see U.S. Electoral College). The relationship between the President and the Congress reflects that between the English monarchy and parliament at the time of the framing of the United States Constitution. Congress can legislate to constrain the President's executive power, even with respect to his or her command of the armed forces; however, this power is used only very rarely—a notable example was the constraint placed on President Richard Nixon's strategy of bombing Cambodia during the Vietnam War. The President cannot directly propose legislation, and must rely on supporters in Congress to promote his or her legislative agenda. The President's signature is required to turn congressional bills into law; in this respect, the President has the power—only occasionally used—to veto congressional legislation. Congress can override a presidential veto with a two-thirds majority vote in both houses. The ultimate power of Congress over the President is that of impeachment or removal of the elected President through a House vote, a Senate trial, and a Senate vote. The threat of using this power has had major political ramifications in the cases of Presidents Andrew Johnson, Richard Nixon, and Bill Clinton. The President makes around 2,000 executive appointments, including members of the Cabinet and ambassadors, which must be approved by the Senate; the President can also issue executive orders and pardons, and has other Constitutional duties, among them the requirement to give a State of the Union address to Congress once a year. Although the President's constitutional role may appear to be constrained, in practice, the office carries enormous prestige that typically eclipses the power of Congress: the Presidency has justifiably been referred to as 'the most powerful office in the world'. The Vice President is first in the line of succession, and is the President of the Senate ex officio, with the ability to cast a tie-breaking vote. The members of the President's Cabinet are responsible for administering the various departments of state, including the Department of Defense, the Justice Department, and the State Department. These departments and department heads have considerable regulatory and political power, and it is they who are responsible for executing federal laws and regulations. George W. Bush is the 43rd President, currently serving his second term.

The Courts

George W. Bush The highest court is the Supreme Court, which consists of nine justices. The court deals with federal and constitutional matters, and can declare legislation made at any level of the government as unconstitutional, nullifying the law and creating precedent for future law and decisions. Below the Supreme Court are the courts of appeals, and below them in turn are the district courts, which are the general trial courts for federal law. Separate from, but not entirely independent of, this federal court system are the individual court systems of each state, each dealing with its own laws and having its own judicial rules and procedures. A case may be appealed from a state court to a federal court only if there is a federal question; the supreme court of each state is the final authority on the interpretation of that state's laws and constitution.

State and local governments

supreme court of each state. Note that Alaska and Hawaii are shown at different scales, and that the Aleutian Islands and the uninhabited Northwestern Hawaiian Islands are omitted from this map.]] The state governments have the greatest influence over people's daily lives. Each state has its own written constitution and has different laws. There are sometimes great differences in law and procedure between the different states, concerning issues such as property, crime, health, and education. The highest elected official of each state is the Governor. Each state also has an elected legislature (bicameral in every state except Nebraska), whose members represent the different parts of the state. Of note is the New Hampshire legislature, which is the third-largest legislative body in the English-speaking world, and has one representative for every 3,000 people. Each state maintains its own judiciary, with the lowest level typically being county courts, and culminating in each state supreme court, though sometimes named differently. In some states, supreme and lower court justices are elected by the people; in others, they are appointed, as they are in the federal system. The institutions that are responsible for local government are typically town, city, or county boards, making laws that affect their particular area. These laws concern issues such as traffic, the sale of alcohol, and keeping animals. The highest elected official of a town or city is usually the mayor. In New England, towns operate directly democratically, and in some states, such as Rhode Island and Connecticut, counties have little or no power, existing only as geographic distinctions. In other areas, county governments have more power, such as to collect taxes and maintain law enforcement agencies.

Political divisions

With the Declaration of Independence, the thirteen colonies proclaimed themselves to be nation states modeled after the European states of the time. Although considered as sovereigns initially, under the Articles of Confederation of 1781 they entered into a "Perpetual Union" and created a fully sovereign federal state, delegating certain powers to the national Congress, including the right to engage in diplomatic relations and to levy war, while each retaining their individual sovereignty, freedom and independence. But the national government proved too ineffective, so the administrative structure of the government was vastly reorganized with the United States Constitution of 1789. Under this new union, the continued status of the individual states as sovereign nation states fell into dispute in 1861, as several states attempted to secede from the union; in response, then-President Abraham Lincoln claimed that such secession was illegal, and the result was the American Civil War. Since the Union victory in 1865, the independent status of the individual states has not been broached again by any state, and the status of each state within the union has been deemed by mainstream officials and academics to be settled as being subordinate to the union as a whole. In subsequent years, the number of states grew steadily due to western expansion, the purchase of lands by the national government from other nation states, and the subdivision of existing states, resulting in the current total of 50. The states are generally divided into smaller administrative regions, including counties, cities and townships. The United States–Canadian border is the longest undefended political boundary in the world. The U.S. is divided into three distinct sections:
- the "continental United States," also known as "the Lower 48" and more accurately termed the conterminous, coterminous or contiguous United States
- Alaska, which is physically connected only to Canada
- the archipelago of Hawaii, in the central Pacific Ocean. The United States also holds several other territories, districts, and possessions, notably the federal district of the District of Columbia, which is the nation's capital, and several overseas insular areas, the most significant of which are American Samoa, Guam, the Northern Mariana Islands, Puerto Rico, and the United States Virgin Islands. The Palmyra Atoll is the United States' only incorporated territory; it is unorganized and uninhabited. The United States Navy has held a base at a portion of Guantanamo Bay, Cuba, since 1898. The United States government possesses a lease to this land, which only mutual agreement or United States abandonment of the area can terminate. The present Cuban government of Fidel Castro disputes this arrangement, claiming Cuba was not truly sovereign at the time of the signing. The United States argues this point moot because Cuba apparently ratified the lease post-revolution, and with full sovereignty, when it cashed one rent check in accordance with the disputed treaty.

Foreign relations and military

sovereign] The immense military and economic dominance of the United States has made foreign relations an especially important topic in its politics, with considerable concern about the image of the United States throughout the world. Reactions towards the United States by other nationalities are often strong, ranging from uninhibited admiration and mimicking of all things American to anti-Americanism. US foreign policy has swung about several times over the course of its history between the poles of strict isolationism and imperialism and everywhere in between. Three of the nation's four military branches are administered by the Department of Defense: the Army, the Navy (including the Marine Corps), and the Air Force. The Coast Guard falls under the jurisdiction of the Department of Homeland Security in peacetime, but is placed under the Department of the Navy in time of war. The combined United States armed forces consist of 1.4 million active duty personnel, along with several hundred thousand each in the Reserves and the National Guard. Military conscription ended in 1973. The United States Armed forces are considered to be the most powerful military (of any sort) on Earth and their force projection capabilities are unrivaled by any other nation. The 2005 defense budget amounted to $401.7 billion, which is an increase of 4% over 2004 and of 35% since 2001. Over 50% of that number is spent in research & development. (For comparison, in 2004 the European Union (considered as the second-largest military force) had a combined total of 1.6 million troops, and a defense budget of €160 billion, with less than 10% of that being spent on R&D.)

Largest cities

The United States has dozens of major cities, including 11 of the 55 global cities of all types — with three "alpha" global cities: New York City, Los Angeles, and Chicago. The figures expressed below are for populations within city limits. A different ranking is evident when considering U.S. metro area populations, although the top three would be unchanged. Note that some cities not listed (such as Atlanta, Boston, Las Vegas, Miami, Nashville, New Orleans, Seattle, and Washington, D.C.) are still considered important on the basis of other factors and issues, including culture, economics, heritage, and politics. The twenty largest cities, based on the United States Census Bureau's 2004 estimates, are as follows:

Economy

The United States has the largest single-country economy in the world, with a per-capita gross domestic product of $40,100. In this market-oriented economy, private individuals and business firms make most of the decisions, and the federal and state governments buy needed goods and services predominantly in the private marketplace. gross domestic product The largest industry of the U.S. is now service, which employs roughly three quarters of the U.S. work force. The United States has many natural resources, including oil and gas, metals, and such minerals as gold, soda ash, and zinc. In agriculture, the U.S. is a top producer of, among other crops, corn, soy beans, and wheat; the United States is a net exporter of food. The U.S. manufacturing sector produces goods such as, cars, airplanes, steel, and electronics, among many others. Economic activity varies greatly from one part of the country to another, with many industries being largely dependent on a certain city or region; New York City is the center of the American financial, publishing, broadcasting, and advertising industries; Silicon Valley is the country’s primary location for high-technology companies, while Los Angeles is the most important center for film production. The Midwest is known for its reliance on manufacturing and heavy industry, with Detroit, Michigan, serving as the center of the American automotive industry; the Great Plains are known as the "breadbasket" of America for their tremendous agricultural output; the intermountain region serves as a mining hub and natural gas resource; the Pacific Northwest for fish and timber, while Texas is largely associated with the oil industry; the Southeast is a major hub for both medical research and the textiles industry. Several countries continue to link their currency to the dollar or even use it as a currency (such as Ecuador), although this practice has subsided since the collapse of the Bretton Woods system. Many markets are also quoted in dollars, such as those of oil and gold. The dollar is also the predominant reserve currency in the world, and more than half of global reserves are in dollars. The largest trading partner of the United States is Canada (19%), followed by China (12%), Mexico (11%), and Japan (8%). More than 50% of total trade is with these four countries. In 2003, the United States was ranked as the third most visited tourist destination in the world; its 40,400,000 visitors ranked behind France's 75,000,000 and Spain's 52,500,000. Labor unions have existed since the 19th century, and grew large and powerful from the 1930s to the 1950s. See Labor history of the United States. Since 1970 they have shrunk in the private sector and now cover fewer than 8% of the workers. However union membership has grown rapidly in the public sector, especially among teachers, nurses, police, postal workers, and municipal clerks. There have been few strikes in recent years. The United States' imports exceed exports by 80%, leading to an annual trade deficit of $700,000,000,000, or 6% of gross domestic product. It is the largest debtor nation in the world, with total gross foreign debt of over $13,000,000,000,000 (2005 estimate); and it absorbs more than 50% of global savings annually. Since the 1980s, the U.S. has increased the use of neoliberal economic policies that reduce government intervention and reduce the size of the welfare state, backing away from the more interventionist Keynsian economic policies that had been in favor since the Great Depression. As a result, the United States provides fewer government-delivered social welfare services than most industrialized nations, choosing instead to keep its tax burden lower and relying more heavily on the free market and private charities. Sixteen states and the District of Columbia have minimum wages higher than the national level ($5.15 per-hour), including the highest, Washington State at $7.35. Twenty-six states are the same as the federal level; two--Ohio and Kansas--are below; and six do not have state laws. America's wealth is relatively highly concentrated. The average C.E.O. earns 500 times the typical amount a worker grosses, this is up from 25 times in the late 1970s. In terms of wealth the top 1% of Americans own 40% of all assets and 50.1% of the country's income goes to the top twenty percent of households. Average wages for the majority of employees have been largely stagnating since the 1970s. America's poverty line defined as a family of four earning less than $19,157 is at 12.7% of the general population. Approximately one out of every five children in the United States grows up below the official poverty line. Among racial groups; African Americans have the lowest median income while Asians had the highest. Regionally, the southern states had the lowest median incomes while the West Coast and New England had the highest. The current Federal Reserve Chairman Alan Greenspan remarked that the U.S.’s growing income inequality since the 1970s is, "not the type of thing which a democratic society - a capitalist democratic society - can really accept without addressing."[http://www.csmonitor.com/2005/0614/p01s03-usec.html?s=itm] However, Greenspan also noted, "...you can look at the system and say it's got a lot of problems to it, and sure it does. It always has. But you can't get around the fact that this is the most extraordinarily successful economy in history."

Transportation

Alan Greenspan ]] Because the United States is a relatively young nation, most of the development of U.S. cities has taken place since the invention of the automobile. To link its vast territory, the United States built a network of high-capacity, high-speed highways, of which the most important element is the Interstate Highway system, commissioned in the 1950s by President Dwight D. Eisenhower and modeled after the German Autobahn. The United States also has a transcontinental rail system, which is used for moving freight across the lower forty-eight states. Passenger rail service is provided by Amtrak, which serves forty-six of the lower forty-eight states. Many cities in the United States have extensive mass-transit systems. New York City operates one of the world's largest and most heavily used subway systems. The regional rail and bus networks that extend into Long Island, New Jersey, Upstate New York, and Connecticut are among the most heavily used in the world. Air travel is often preferred for destinations over 300 miles (500 kilometers) away. In terms of passengers, seventeen of the world's thirty busiest airports in 2004 were in the U.S., including the world's busiest, Hartsfield-Jackson Atlanta International Airport; in terms of cargo, in the same year, twelve of the world's thirty busiest airports were in the U.S., including the world's busiest, Memphis International Airport. There are several major seaports in the United States; the three busiest are the Port of Los Angeles, California; the Port of Long Beach, California; and the Port of New York and New Jersey. Others include Houston, Texas; Charleston, South Carolina; Savannah, Georgia; Miami, Florida; Portland, Oregon; San Francisco, California; Boston, Massachusetts; Philadelphia, Pennsylvania; and Seattle, Washington; plus, outside the contiguous forty-eight states, Anchorage, Alaska, and Honolulu, Hawaii.

Society

Demographics

Hawaii The mean center of the U.S. population continues to drift farther west and south. The fastest growing region is the western United States followed by the southern portion. According to Census 2000, the states that saw the greatest increases from 1990 were: Nevada (66.3%), Arizona (40%), Colorado (30.6%), Utah (29.6%), Idaho (28.5%), Georgia (26.4%), Florida (23.5%), Texas (22.8%), North Carolina (21.4%), and Washington (21.1%). [http://www.census.gov/population/cen2000/phc-t2/tab03.pdf]

Ethnicity and race

:Main article: Racial demographics of the United States The United States is a very racially diverse country. According to the 2000 census, it has 31 ethnic groups with at least one million members each, and numerous others represented in smaller amounts. The majority of Americans descend from white European immigrants who arrived at the establishment of the first colonies (most after Reconstruction). This majority--69.1% in 2000--decreases each year, and is expected to become a plurality within a few decades. The most frequently stated European ancestries are German (15.2%), Irish (10.8%), English (8.7%), Italian (5.6%) and Scandinavian (3.7%). Many immigrants also hail from Slavic countries such as Poland and Russia. Other significant immigrant populations came from eastern and southern Europe and French Canada. Russia Hispanics from Mexico and South and Central America are the largest minority group in the country, comprising 12.5% of the population (2000 census). People of Mexican descent made up 7.3% of the population in the 2000 census, and this proportion is expected to increase significantly in the coming decades. About 12.3% (2000 census) of the American people are African Americans (Blacks). African Americans are spread throughout the country, but their presence is largest in the South. Asian Americans--including Native Hawaiians and Pacific Islanders--are a third significant minority (3.7% of the population in 2000). Most Asian Americans are concentrated on the West Coast and Hawaii. The largest groups are immigrants or descendants of emigrants from the Philippines, China, India, Vietnam, South Korea, and Japan. Indigenous peoples in the United States, such as American Indians and Inuit, make up 0.9% of the population (2000 census). About 35% live on Indian reservations.

Religion

Polls estimate that just under 80 percent of Americans are Christians of various denominations. The other 20 percent comprises other religions such as Hinduism, Judaism, Islam, and Buddhism, other various faiths, and those without a specific religion. The United States is noteworthy among developed nations for its relatively high level of religiosity. According to a 2004 Gallup poll, about 44% of Americans attend a religious service at least once a week. However, this rate is not uniform across the country; attendance is more common in the Bible Belt—composed largely of Southern and Midwestern states—than in the Northeast and West Coast. In the Southern states, Baptists are the largest group, followed by Methodists; Roman Catholics are dominant in the Northeast and in large parts of the Midwest due to their being settled by descendants of Catholic immigrants from Europe (such as Germany, Ireland, Italy, and Poland) or other parts of North America (mainly Quebec and Puerto Rico). The rest of the country for the most part has a complex mixture of various Christian groups.

Education

West Coast's home at Monticello and the University of Virginia (library building shown above, and designed by Jefferson), the only collegiate campus on the list. Both sites are located in Charlottesville, Virginia.]] In the United States, education is a state, not federal, responsibility, and the laws and standards vary considerably. However, the federal government, through the Department of Education, is involved with funding of some programs and exerts some influence through its ability to control funding. In most states, all students must attend mandatory schooling starting with kindergarten, which children normally enter at age 5, and following through 12th grade, which is normally completed at age 18

Stonehenge

Stonehenge is a Neolithic and Bronze Age monument located near Amesbury in the English county of Wiltshire, about 8 miles (13 km) northwest of Salisbury. It is composed of earthworks surrounding a circular setting of large standing stones, known as megaliths. There is some debate about the age of the stone circle, but most archaeologists think that it was mainly constructed between 2500 BC and 2000 BC. The older circular earth bank and ditch, which constitute perhaps the earliest phase of the monument, have been dated to about 3100 BC. The site and its surroundings were added to the UNESCO's list of World Heritage Sites in 1986. It is also a legally protected Scheduled Ancient Monument. The monument itself is owned and managed by English Heritage whilst the surrounding downland is owned by the National Trust. Stonehenge is located at .

Etymology

Christopher Chippendale's Stonehenge Complete gives the derivation of Stonehenge as being from the Old English words "stān" meaning "stone", and either "hencg" meaning "hinge" (because the stone lintels hinge on the upright stones) or "hen(c)en" meaning "gallows" or "instrument of torture". Medieval gallows consisted of two uprights with a lintel joining them rather than the inverted L-shape more familiar today. The "henge" portion has given its name to a class of monuments known as henges. Archaeologists define henges as earthworks consisting of a circular banked enclosure with an internal ditch. As often happens in archaeological terminology, this is a holdover from antiquarian usage, and Stonehenge cannot in fact be truly classified as a henge site as its bank is inside its ditch. Despite being contemporary with true Neolithic henges and stone circles, Stonehenge is in many ways atypical. For example, its extant trilithons make Stonehenge unique. Stonehenge is only distantly related to the other stone circles in the British Isles, such as the Ring of Brodgar.

Development of Stonehenge

Ring of Brodgar The Stonehenge complex was built in several construction phases spanning 2,000 years, although there is evidence for activity both before and afterwards on the site. Archaeologists have found three large Mesolithic postholes which date to around 8000 BC nearby, beneath the modern tourist car-park, and which may have had ritual significance, although there is no suggestion they are connected with the later monument. During the earlier Neolithic, a cursus monument was built 600m north of the site as the first farmers began to exploit the area. Later prehistoric pottery, Roman coins and the burial of a decapitated Saxon man have been excavated from Stonehenge, the last dated to the 7th century AD. Dating and understanding the various phases of activity at Stonehenge is not a simple task; it is complicated by poorly-kept early excavation records, surprisingly few accurate scientific dates and the disturbance of the natural chalk by periglacial effects and animal burrowing. The modern phasing most generally agreed by archaeologists is detailed below. Features mentioned in the text are numbered and shown on the plan, right, which illustrates the site as of AD 2004. The plan omits the trilithon lintels for clarity. Holes that no longer, or never, contained stones are shown as open circles and stones visible today are shown coloured.

Stonehenge 1

AD 2004 The first monument consisted of a circular bank and ditch enclosure (7 and 8) measuring around 115 m (320 feet) in diameter with a large entrance to the north east and a smaller one to the south (14). The builders placed bones of deer and oxen in the bottom of the ditch. These bones were considerably older than the antler picks used to dig the ditch and had been well looked-after for some time prior to burial. The ditch itself was continuous but had been dug in sections like the earlier causewayed enclosures and the chalk spoil piled up to form the bank. This first stage is dated to around 3100 BC after which the ditch began to silt up naturally. Within the outer edge of the enclosed area was dug a circle of 56 pits each around 1m in diameter (13), known as Aubrey holes after John Aubrey, the seventeenth century antiquarian who was thought to have first identified them. The pits may have contained standing timbers although there is no excavated evidence of them. A small outer bank beyond the ditch could also date to this period (9).

Stonehenge 2

Evidence of the second phase is no longer visible. It appears from the number of postholes dating to this period that some form of timber structure was built within the enclosure during the early 3rd millennium BC. Further standing timbers were placed at the northeast entrance and a parallel alignment of posts ran inwards from the southern entrance. The postholes are smaller than the Aubrey Holes, being only around 0.4m in diameter and are much less regularly spaced. The bank was purposely reduced in height and the ditch continued to silt up. At least twenty-five of the Aubrey Holes are known to have contained later, intrusive, cremation burials dating to the two centuries after the monument's inception. It seems that whatever the holes' initial function, it changed to become a funerary one during Phase 2. Thirty further cremations were placed in the enclosure's ditch and at other points within the monument, mostly in the eastern half. Stonehenge is therefore interpreted as functioning as an enclosed cremation cemetery at this time, the earliest known cremation cemetery in the British Isles. Fragments of unburnt human bone have also been found in the ditch fill. Late Neolithic grooved ware pottery has been found in connection with the features from this phase providing dating evidence.

Stonehenge 3i

Archaeological excavation has indicated that around 2600 BC, timber was abandoned in favour of stone and two concentric crescents of holes (called the Q and R Holes) were dug in the centre of the site. Again, there is little firm dating evidence for this phase. The holes held 80 standing bluestones (shown blue on the plan) brought from the Preseli Hills, 250 km away in modern day Pembrokeshire in Wales. The stones, which weighed about four tons, consisted mostly of spotted dolerite but included examples of rhyolite, tuff and volcanic and calcareous ash. Each measures around 2m in height, between 1m and 1.5m wide and around 0.8m thick. What was to become known as the Altar Stone (1), a six-ton specimen of green micaceous sandstone twice the height of the bluestones, was also brought from the Welsh coast near Preseli and may have stood as a single large monolith. The north eastern entrance was also widened at this time with the result that it precisely matched the direction of the midsummer sunrise and midwinter sunset of the period. This phase of the monument was abandoned unfinished however, the bluestones were apparently removed and the Q and R holes purposefully backfilled. Even so, the monument appears to have eclipsed the site at Avebury in importance towards the end of this phase and the Amesbury Archer, found in 2002 three miles (5 km) to the south, would have seen the site in this state. The Heel Stone (5) may also have been erected outside the north eastern entrance during this period although it cannot be securely dated and may have been installed at any time in phase 3. At first, a second stone, now no longer visible, joined it. Two, or possibly three, large portal stones were set up just inside the northeastern entrance of which only one, the fallen Slaughter Stone (4), 16 ft (4.9 m) long, now remains. Other features loosely dated to phase 3 include the four Station Stones (6), two of which stood atop mounds (2 and 3). The mounds are known as 'barrows' although they do not contain burials. The Avenue, (10), a parallel pair of ditches and banks leading 3 km to the River Avon was also added. Ditches were later dug around the Station Stones and the Heel Stone, which was by then reduced to a single monolith.

Stonehenge 3ii

The next major phase of activity at the tail end of the 3rd millennium BC saw 30 enormous Sarsen stones (shown grey on the plan) brought from a quarry around 24 miles (40 km) north to the site on the Marlborough Downs. The stones were dressed and fashioned with mortise and tenon joints before 30 were erected as a 33 m (108 ft) diameter circle of standing stones with a 'lintel' of 30 stones resting on top. The lintels themselves were joined to one another using another woodworking method, the tongue in groove joint . Each stone weighed around 25 tons and had clearly been worked with the final effect in mind. The orthostats widen slightly towards the top in order that their perspective remains constant as they rise up from the ground whilst the lintel stones curve slightly to continue the circular appearance of the earlier monument. The sides of the stones that face inwards are more finely worked than the sides that face outwards. A total of 74 stones would have been needed to complete the circle and unless some of the sarsens were removed from the site, it would seem that the ring was left incomplete. Within this circle stood five trilithons of dressed sarsen stone arranged in a horseshoe shape. These huge stones, ten uprights and five lintels, weigh up to 50 tons each and were again linked using complex jointings. The images of a 'dagger' and 14 'axe-heads' have been recorded carved on one of the sarsens, known as stone 53. Further axe-head carvings have been seen on the outer faces of stones known as numbers 3, 4, and 5. They are difficult to date but are morphologically similar to later Bronze Age weapons. The pair of trilithons in north east are smallest, measuring around 6m (20 feet) in height and the largest is the trilithon in the south west of the horseshoe is almost 7.5m (24 feet) tall. This ambitious phase is radiocarbon dated to between 2440 and 2100 BC.

Stonehenge 3iii

Later in the Bronze Age, the bluestones appear to have been re-erected for the first time although the precise details of this period are still unclear. They were placed within the outer sarsen circle and at this time may have been trimmed in some way. A few have timber working-style cuts in them like the sarsens themselves, suggesting they may have been linked with lintels and part of a larger structure during this phase.

Stonehenge 3iv

This phase saw further rearrangement of the bluestones as they were placed in a circle between the two settings of sarsens and in an oval in the very centre. Some archaeologists argue that some of the bluestones in this period were part of a second group brought from Wales. All the stones were well-spaced uprights without any linking lintels inferred in Stonehenge 3iii. The Altar Stone may have been moved within the oval and stood vertically. Although this would seem the most impressive phase of work, Stonehenge 3iv was rather shabbily built compared to its immediate predecessors, the newly re-installed bluestones were not at all well founded and began to fall over. However, only minor changes were made after this phase. Stonehenge 3iv dates from 2280 to 1930 BC.

Stonehenge 3v

Soon afterwards, the north eastern section of the Phase 3iv Bluestone circle was removed, creating a horseshoe-shaped setting termed the Bluestone Horseshoe. This mirrored the shape of the central sarsen Trilithons and dates from 2270 to 1930 BC. This phase is contemporary with the famous Seahenge site in Norfolk.

Stonehenge 3vi

Two further rings of pits were dug outside the outermost sarsen circle, called the Y and Z Holes (11 and 12). The Z holes were about 2m outside the outermost sarsen circle and the Y holes about 5m further out. These were each of thirty pits and each seems to match with one of the uprights in the outer sarsen circle. They were never filled with stones however and were permitted to silt up over the next few centuries; their upper fills contain Iron Age and Roman material. Monument building at Stonehenge appears to have been abandoned around 1600 BC.

Theories about Stonehenge

Early interpretations

1600 BC Many early historians were influenced by supernatural folktales in their explanations. Some legends held that Merlin the wizard had a giant build the structure for him or that he had magically transported it from Mount Killaraus in Ireland, while others held the Devil responsible. Henry of Huntingdon was the first to write of the monument around 1130 soon followed by Geoffrey of Monmouth who was the first to record fanciful associations with King Arthur which led the monument to be incorporated into the wider cycle of European medieval romance. In 1615, Inigo Jones argued that Stonehenge was a Roman temple, dedicated to 'Cnelus', a pagan god, and built following the Tuscan order. Later commentators maintained that the Danes erected it. Indeed, up until the late nineteenth century, the site was commonly attributed to the Saxons or other relatively recent societies. The first academic effort to survey and understand the monument was made around 1740 by William Stukeley. As was his wont, Stukeley incorrectly attributed the site to the Druids. He contributed measured drawings of the site, which permitted greater analysis of its form and significance. From this work he was able to demonstrate an astronomical or calendrical role in the stones' placement. By the turn of the nineteenth century, John Lubbock was able to attribute the site to the Bronze Age based on the bronze objects found in the nearby barrows.

Archaeoastronomy and Stonehenge

For further information, see Archaeoastronomy and Stonehenge. Stonehenge is aligned north east — south west, and it has been suggested that particular significance was placed by its builders on the solstice and equinox points, so for example on a midsummer's morning, the sun rose close to the Heel Stone, and the sun's first rays went directly into the centre of the monument between the horseshoe arrangement. It is unlikely that such an alignment can have been merely accidental. A huge debate was triggered by the 1963 publication of Stonehenge Decoded, by British born astronomer Gerald Hawkins, who claimed to see a large number of alignments, both lunar and solar, and argued that Stonehenge could have been used to predict eclipses. Hawkins' book received wide publicity, partly because he used a computer in his calculations, then a rarity. Archaeologists were suspicious in the face of further contributions to the debate coming from British astronomer C. A. Newham and Sir Fred Hoyle, the famous Cambridge Cosmologist, as well as by Alexander Thom, a retired professor of engineering, who had been studying stone circles for more than 20 years. Their theories have faced criticism in recent decades from Richard Atkinson and others who have suggested impracticalities in the 'Stone Age calculator' interpretative approach. Today, the consensus is that some of the astronomical case, although not all, was overstated. Even so, since the sun rises in different directions in different geographical latitudes, for the alignment to be correct, it must have been calculated precisely for Stonehenge's latitude of 51° 11'. This alignment, therefore, must have been fundamental to the design and placement of at least some of Stonehenge's phases. The recent discovery of a neighbour to the Heel Stone has challenged the interpretation of it as a midsummer sunrise marker and it may have instead been one side of a 'solar corridor' used to frame the sunrise. Sun worship is certainly not an uncommon phenomenon amongst Neolithic peoples given their reliance on it for crop fertility. Despite as many as 20,000 people visiting Stonehenge during the 2005 summer solstice, growing evidence indicates that ancestors did not visit at all in the summer, but rather during the winter solstice. The only megalithic monument in the British Isles to contain a clear, compelling solar alignment is Newgrange which famously faces the winter solstice sunrise. The most recent such evidence includes bones and teeth from pigs that were slaughtered at nearby Durrington Walls, their age at death indicating that they were slaughtered either in December or January every year. Mike Parker Pearson of the University of Sheffield has said "We have no evidence that anyone was in the landscape in summer." ^{[http://www.telegraph.co.uk/news/main.jhtml?xml=/news/2005/06/21/nsolst21.xml&sSheet=/portal/2005/06/21/ixportal.html]}

The bluestones

Roger Mercer has observed that the bluestones are incongruously finely worked and has suggested that they were transferred to Salisbury Plain from an as yet unlocated earlier monument in Pembrokeshire, Wales. If Mercer's theory is correct then the bluestones may have been transplanted to cement an alliance or display superiority over a conquered enemy although this can only be speculation. Oval shaped settings of bluestones similar to those at Stonehenge 3iv are also known at the sites of Bedd Arthur in the Preseli Hills and at Skomer Island off the southwest coast of Pembrokeshire. Some archaeologists have suggested that the igneous bluestones and sedimentary sarsens had some symbolism, of a union between two cultures from different landscapes and therefore from different backgrounds. Recent analysis of contemporary burials found nearby known as the Boscombe Bowmen, has indicated that at least some of the individuals associated with Stonehenge 3 did indeed come from modern day Wales. Petrological analysis of the stones themselves has verified that they could only have come from the Preseli Hills and it is tempting to connect the two. The main source of the bluestones is now identified with the dolerite outcrops at Carn Menyn although work led by Olwen Williams-Thorpe of the Open University has shown that further bluestone sources over a wider area of Preseli were also exploited. Aubrey Burl contends that the bluestones were not transported by human agency at all and were instead brought by glaciers at least part of the way from Wales during the Pleistocene. No geological evidence has been found for any glacial activity between Preseli and Salisbury Plain however and no further specimens of the unusual dolerite stone have been found in the vicinity.

Stonehenge as part of a ritual landscape

Pleistocene Many archaeologists believe Stonehenge was an attempt to render in permanent stone the more common timber structures that dotted Salisbury Plain at the time, such as those that stood at Durrington Walls. Modern anthropological evidence has been used by Mike Parker Pearson and the Madagascan archaeologist Ramilisonina to suggest that timber was associated with the living and stone with the ancestral dead. They have argued that Stonehenge was the terminus of a long, ritualised funerary procession, which began in the east at sunrise at Woodhenge and Durrington Walls, moved down the Avon and then along the Avenue reaching Stonehenge in the west at sunset. The journey from wood to stone via water was a symbolic journey from life to death. There is no satisfactory evidence to suggest that Stonehenge's astronomical alignments were anything more than symbolic and current interpretations favour a ritual role for the monument that takes into account its numerous burials and its presence within a wider landscape of sacred sites.

Construction techniques and design

Durrington Walls Durrington Walls Much speculation has surrounded the engineering f