The dark maria are the most conspicuous features of the Moon, but more important are the giant basins that contain them. Each basin controls the geology of the area around it. One easy-to-see example is the Humorum basin, whose central depression is partially filled by the lava plains of Mare Humorum. This mid-size impact basin preserves many structural features that one can appreciate only by careful observation. So let's do so!
展开▼