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crater a hollow area shaped like the inside of a bowl. The mouth of a volcano is a crater, and the moon has many craters on its surface.
igneous having to do with rocks formed by a volcano or other source of great heat.
lava hot, melted rock that erupts from a volcano. [1/2 definitions]
magma hot, liquid matter beneath the earth's surface that cools to form igneous rock. Magma that reaches the earth's surface, as when a volcano erupts, is called lava.