Other Free Encyclopedias » 21st Century Webster's Family Encyclopedia » 21st Century Webster's Family Encyclopedia - Constance Missal to Crete


craters earth meteorites volcanic

Crater, depression on the surface of the earth or other celestial body. Craters are caused by volcanic activity or the impact of heavy objects from space (meteorites). Most craters on earth are volcanic. Craters are numerous on the moon, which lacks an atmosphere capable of burning out meteorites before they crash into the surface.

Crater Lake National Park [next] [back] Marcus Licinius Crassus

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