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Alidade - An optical surveyor's instrument used in the field to create topographic maps and top plans.Today alidades are being replaced by Total Stations.Alloy - A substance made by the mixture of two or more elements, at least one of which is a metal.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.It is generally a raised area above the rest of the city where the most important sacred and secular buildings are brought together.The buildings on the Athenian Acropolis were important for trade and worship.
It was characterized by large bifaces, particularly hand axes.
This tool-making technology was a more complex way of making stone tools than the earlier Oldowan technology.
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.
Aerial Reconnaisance - The technique of searching for sites and features, both cultural and natural, from the air, often using aerial photography or the human eye.
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.