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.

Transportation or other fuels that are made in whole or in part from renewably sourced plant materials such as corn, wheat or sugar cane.

One-star words are frequent, two-star words are more frequent, and three-star words are the most frequent.Products (other than food or feed) that are composed in whole or in part of renewable agricultural crops such as corn, wheat, or sugar cane; also refers to materials made using biological processes regardless of the feedstock source.Butanol (COH) that is produced from agricultural feedstock rather than petroleum.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 Reconnaissance - The technique of searching for sites and features, both cultural and natural, from the air, often using aerial photography or the human eye.