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In an aristocracy people are generally born into distinct social classes and there is little or no upward mobility. Chert - A fine-grained sedimentary rock, similar to flint, that is white, pinkish, brown, gray, or blue-gray in color.
Artifact - A portable object manufactured, modified, or used by humans. Years are counted back from the traditionally recognized year of Christ's birth. In antiquity, chert was one of the universally preferred materials for making stone tools (obsidian was another).
The buildings on the Athenian Acropolis were important for trade and worship.
Aerial Photography - The various techniques of taking photographs of natural or cultural features from the air, using balloons, airplanes, satellites, and other sources, in order to study the features in their entirety from a top-down (bird's eye) view.
Alluvial Deposit - Soil deposited by running water, such as streams, rivers, and flood waters.
Many ancient peoples, such as the Egyptians living along the Nile, depended on annual floods and alluvial deposits to replenish the soils they were farming.
This tool-making technology was a more complex way of making stone tools than the earlier Oldowan technology.
More flakes were knocked off from both sides of a stone and there is evidence that the maker had a preconceived notion of the tool's final form.
Bronze is an alloy of copper and either zinc or tin.Amphora - A two-handled pottery jar with a narrow neck used by the ancient Greeks and Romans to carry liquids, especially wine and oil.AMS - Accelerator Mass Spectrometry is an absolute dating technique that measures the amount of carbon-14 in an organic object and provides a rough indication of its age. Anthropology - The study of human beings, including their behavior, biology, linguistics, and social and cultural variations.In the United States, anthropology is divided into four sub-disciplines: archaeology, biological/physical anthropology, cultural anthropology, and linguistics.All the sub-disciplines study aspects of past or present humans.