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extrusive rock
Introduction References & Edit History Quick Facts & Related Topics
Images
Tanna Island, Vanuatu: volcanic rock basalt Figure 25: Cross section of a convergent plate boundary involving a collision between two continental plates near a Himalaya-type mountain chain.
Quizzes
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

extrusive rock: References & Edit History

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  • The Editors of Encyclopaedia Britannica
    Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree. They write new content and verify and edit content received from contributors.

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Article History

Type Description Contributor Date
Replaced photograph. Sep 21, 2015
Invalidated site: United States Geological Survey - Extrusive and Intrusive Rocks. Mar 18, 2014
Add new Web site: Hyperphysics - Intrusive and Extrusive Rocks. Dec 26, 2011
Add new Web site: United States Geological Survey - Extrusive and Intrusive Rocks. Dec 26, 2011
Added image of volcanic rock off the coast of Tanna Island. Jan 08, 2010
Article added to new online database. Jul 20, 1998
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