Metamorphic rock

Cultural Dictionary

metamorphic rock definition


Rock that was once one form of rock but has changed to another under the influence of heat, pressure, or some other agent without passing through a liquid phase.

Note: Examples are marble, which can be formed from limestone, and slate, which is formed from shale.
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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