This article focuses on the geology of a single area of the Moon, the Imbrium Basin, and shows how geologists have combined basic geologic principles with evidence collected by the Apollo missions to learn more about the history of the Moon as a whole. In this article, the author discusses lunar geology teaching tips and mapping the Imbrium Basin based on the following elementary geologic principles: (1) superposition; (2) intersection; (3) density of impact craters; and (4) sharpness of topography. He also discusses the geologic evolution of the moon. (Contains 8 figures.)