heavily cratered older part of Moon's surface.

areas on the Moon covered with craters

The densely cratered portions of the Moon that are typically at higher elevations than the mare plains. The highlands contain a significant proportion of anorthosite, an igneous rock made up almost entirely of plagioclase feldspar.

Places on the moon that are above the level that may have been smoothed by flowing lava.

Relatively light-colored regions on the surface of the Moon which are elevated several kilometers above the maria. Also called terrae.

The older, heavily cratered crust of the Moon, covering 83 percent of its surface and composed in large part of anorthositic breccias.