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intrusive rock
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intrusive igneous rock
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Basalt sample returned by Apollo 15, from near a long sinous lunar valley called Hadley Rille. Measured at 3.3 years old.
(Bed) Rocks and (Flint) Stones
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Also called:
plutonic rock
Related Topics:
granite
diabase
gabbro
anorthosite
nepheline syenite
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intrusive rock

geology
Also known as: intrusive igneous rock, plutonic rock
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History

intrusive rock, igneous rock formed from magma forced into older rocks at depths within the Earth’s crust, which then slowly solidifies below the Earth’s surface, though it may later be exposed by erosion. Igneous intrusions form a variety of rock types. See also extrusive rock.

This article was most recently revised and updated by John P. Rafferty.