from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun geology one of the major groups of rock that makes up the
crustof the Earth; consists of pre-existingrock mass in which new mineralsor texturesare formed at higher temperaturesand greater pressuresthan those present on the Earth's surface
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun rock altered by pressure and heat
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