from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. one of the major groups of rock that makes up the crust of the Earth; consists of pre-existing rock mass in which new minerals or textures are formed at higher temperatures and greater pressures than those present on the Earth's surface
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. rock altered by pressure and heat
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