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lunar features ![click to hear : lunar features click to hear : lunar features](../../../images/speaker-vert.gif)
Aspect of the Moon determined by past volcanic activity, meteorite impact and soil fractures.
cliff ![click to hear : cliff click to hear : cliff](../../../images/speaker-vert.gif)
Steep rock face shaped by a sea.
bay ![click to hear : bay click to hear : bay](../../../images/speaker-vert.gif)
Small plain of hardened lava located along the edges of a sea.
ocean ![click to hear : ocean click to hear : ocean](../../../images/speaker-vert.gif)
A very large sea.
crater ![click to hear : crater click to hear : crater](../../../images/speaker-vert.gif)
Circular basin dug out by the impact of a meteorite.
wall ![click to hear : wall click to hear : wall](../../../images/speaker-vert.gif)
Mountain usually surrounding a cirque.
mountain range ![click to hear : mountain range click to hear : mountain range](../../../images/speaker-vert.gif)
Vestiges of the walls of a once-large crater; semicircular in shape, it can span hundreds of kilometers.
sea ![click to hear : sea click to hear : sea](../../../images/speaker-vert.gif)
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 : lake click to hear : lake](../../../images/speaker-vert.gif)
Small isolated plain of hardened lava.
highland ![click to hear : highland click to hear : highland](../../../images/speaker-vert.gif)
Designates bright regions riddled with craters; these oldest regions cover 85% of the surface.
crater ray ![click to hear : crater ray click to hear : crater ray](../../../images/speaker-vert.gif)
Band that radiates from a young crater, the result of matter ejected during a meteorite impact.
cirque ![click to hear : cirque click to hear : cirque](../../../images/speaker-vert.gif)
Vast crater characterized by remarkable relief; varies between 20 and 200 km in diameter.