When rising magma cools and solidifies below the Earth's surface then it forms intrusive Igneous Rocks. These rocks are coarse grained. The central cores of major mountain ranges consist of intrusive igneous rocks, usually granite. Coarse grained intrusive igneous rocks which form at depth within the crust are termed as abyssal; intrusive igneous rocks which are near the surface are termed hypabyssal.Eg. Granite, Basalt, Diorite etc.
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| http://geology.campus.ad.csulb.edu/people/bperry/IgneousRocksTour/IntrusiveIgneousRocks.html |
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