This page is under construction. Many of these definitions are placeholders and not the final ones.
- Highlands - bright, extensively cratered areas of igneous rocks rich in the mineral plagioclase, breccias, and the chemicals calcium and aluminium.
- Maria - dark areas covered by lavas of the volcanic rock type called [[Basalt|basalt.
- Impact crater - roughly circular depression formed by the hypervelocity impact of a smaller rock body.
- Crater ejecta - the debris that is thrown out by the formation of an impact crater. If the material covers the immediate
- Terraced crater walls - steep walls of an impact crater with stair steps created by slumping due to gravity and landslides.
- Ray - the light-toned material that is deposited in a radial pattern around a newly formed crater. It is bright because it is finely pulverized rock and the fractured crystals are very reflective.
- Central peak uplift - mountain in the center of large impact craters.
- Multi-ringed basin - huge impact crater surrounded by concentric mountain chains.
- Lava flow
- Wrinkle ridge
- Cinder cone