metamorphic

A rock type that results from a parent rock type changing under the influence of heat, pressure, or some other agent without passing through a liquid phase.

Citation: 
Adapted from "metamorphic-rock." The American Heritage® New Dictionary of Cultural Literacy, Third Edition. Houghton Mifflin Company, 2005. 01 Dec. 2015. <Dictionary.com http://dictionary.reference.com/browse/metamorphic-rock>.
English

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