Definitions for igneous rock
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Princeton's WordNet
igneous rock(noun)
rock formed by the solidification of molten magma
Wiktionary
igneous rock(Noun)
one of the major groups of rock that makes up the crust of the Earth; formed by the cooling of molten rock, either below the surface (intrusive) or on the surface (extrusive)
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"igneous rock." Definitions.net. STANDS4 LLC, 2013. Web. 20 Jun 2013. <http://www.definitions.net/definition/igneous rock>.

