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