igneous rock

Cultural Dictionary
igneous rock [(ig-nee-uhs)]

Rocks formed by the cooling and solidifying of molten materials. Igneous rocks can form beneath the Earth's surface, or at its surface, as lava.

Note: Granite, solid volcanic lava, and basalt are examples of igneous rock.
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
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