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This is a good way to search for patterns or changes in soil color or plant density (possible indicators of buried features) that may not be visible to a person walking on the ground.Agora - An open-air place of congregation in an ancient Greek city, generally the public square or marketplace, that served as a political, civic, religious, and commercial center.It is generally a raised area above the rest of the city where the most important sacred and secular buildings are brought together.

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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.

Acropolis - The "high point" or citadel of an ancient Greek city, like the Acropolis in Athens.

All the sub-disciplines study aspects of past or present humans.

Archaeologists generally study the physical and material remains of ancient societies, while cultural anthropologists study living cultures.

Linguists study languages, especially their development and their function within human culture. Back dirt - The excavated, discarded material (sediment, dirt) from a site that has generally been sifted for artifacts and is presumed to be of no further archaeological significance.

Antiquarian - A term generally indicating a pre-20th-century collector of ancient artifacts before the development of scientific archaeology and the establishment of standards for excavating and preserving finds. This material may later be used to refill test pits, an action referred to as "back filling." Balk - A side wall of an excavated unit (square) or a partition of earth left standing between adjoining excavation units.

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.

Alluvial soils are usually nutrient-rich and good for agriculture.

Alloy - A substance made by the mixture of two or more elements, at least one of which is a metal.

Alloys are often stronger and more durable than pure metals.

Archaeoastronomy - The study of ancient astronomical knowledge and its role in past cultures. - Before Present; used in age determination instead of B. Balks are often left to aid with stratigraphic analysis.

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