lunar features![click to hear](/images/speaker.jpg)
Aspect of the Moon determined by past volcanic activity, meteorite impact and soil fractures.
cliff ![click to hear](/images/speaker.jpg)
Steep rock face shaped by a sea.
bay ![click to hear](/images/speaker.jpg)
Small plain of hardened lava located along the edges of a sea.
ocean ![click to hear](/images/speaker.jpg)
A very large sea.
crater ![click to hear](/images/speaker.jpg)
Circular basin dug out by the impact of a meteorite.
wall ![click to hear](/images/speaker.jpg)
Mountain usually surrounding a cirque.
mountain range ![click to hear](/images/speaker.jpg)
Vestiges of the walls of a once-large crater; semicircular in shape, it can span hundreds of miles.
sea ![click to hear](/images/speaker.jpg)
Designates the vast plains of hardened lava forming the dark regions; younger than the highlands, these cover 15% of the surface.
lake ![click to hear](/images/speaker.jpg)
Small isolated plain of hardened lava.
highland ![click to hear](/images/speaker.jpg)
Designates bright regions riddled with craters; these oldest regions cover 85% of the surface.
crater ray ![click to hear](/images/speaker.jpg)
Band that radiates from a young crater, the result of matter ejected during a meteorite impact.
cirque ![click to hear](/images/speaker.jpg)
Vast crater characterized by remarkable relief; varies between 12 and 120 mi in diameter.