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sheet flow
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sheet flow

geology

Learn about this topic in these articles:

structure of oceanic crust

  • Earth's lithosphere and upper mantle
    In oceanic crust

    Sheet flows have the appearance of wrinkled bed sheets. They commonly are thin (only about 10 cm [4 inches] thick) and cover a broader area than pillow lavas. There is evidence that sheet flows are erupted at higher temperatures than those of the pillow variety.…

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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

intrusive rock

geology
Also known as: intrusive igneous rock, plutonic rock
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Also called:
plutonic rock
Related Topics:
granite
diabase
gabbro
anorthosite
nepheline syenite

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.
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