intrusive rock

Main Entry:  intrusive rock
Part of Speech:  n
Definition:  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
Example:  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.
Etymology:  1844
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