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intrusive rock

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intrusive rock

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Altered granite through a polarized microscope. Granite is the most common type of intrusive rock.

Igneous rock formed beneath the Earth's surface. Magma, or molten rock, cools slowly at these depths to form coarse-grained rocks, such as granite, with large crystals. (Extrusive rocks, which are formed on the surface, are generally fine-grained.) A mass of intrusive rock is called an intrusion.



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? Mentioned in ? References in periodicals archive
 
The mapping showed areas of intrusive rocks “similar to those found in the California District.
Medium- to coarse-grained rock that is one of the most abundant intrusive rocks.
Medium- to coarse-grained rock that is one of the most abundant intrusive rocks.
 
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