|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.|
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