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intrusive rock

noun

in geology, magma forced into cavities or cracks of other rocks and crystallized but not reaching the surface; also called plutonic rock , igneous intrusive rock

Examples

In composition, intrusive rocks include the entire sequence of igneous rock types from the dense and dark ultramafic peridotites to the very light-colored and low-density alkali granites and syenites.

Word Origin

1844

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