MOON TOPICS GEOLOGY & PLANETARY SCIENCE A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U  V  W  X  Y  Z                    HOME ABOUT CATEGORIES SITE MAP COPYRIGHT ADVERTISE CONTACT entire Web this site maria Large dark regions on the surface of the Moon, once thought to be seas, now known to be lava-flooded basins. The term "mare soil" refers to the sediment on the surface of the lunar maria; it consists of fragments of basalt rocks, broken mineral grains, and glass produced by impact. Related categories    • MOON TOPICS    • GEOLOGY AND PLANETARY SCIENCE Also on this site: Encyclopedia of Alternative Energy & Sustainable Living Encyclopedia of History Transport Concepts & Designs (partner site) BACK TO TOP