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Intrusion - Wikipedia, the free encyclopedia
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Intrusion
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"Intrusive" redirects here. For other uses, see
Intrusive (disambiguation).
This article is largely based on an article in the out-of-copyright
11th edition of the Encyclopædia Britannica, which was produced in 1911. It should be brought up to date to reflect subsequent history or scholarship (including the references, if any). When you have completed the review, replace this notice with a simple note on this article's talk page. Thanks!
Devils Tower National Monument, an igneous intrusion exposed when the surrounding softer rock eroded away.
An intrusion is liquid rock that forms under Earth's surface.
Magma from under the surface is slowly pushed up from deep within the earth into any cracks or spaces it can find, sometimes pushing existing
country rock out of the way, a process that can take millions of years. As the rock slowly cools into a solid, the different parts of the magma
crystallize into minerals. Many mountain ranges, such as the
Sierra Nevada in California, are formed mostly by intrusive rock, large granite (or related rock) formations.
Intrusions are one of the two ways
igneous rock can form; the other is
extrusive, that is, a volcano eruption or similar event. Technically speaking, an intrusion is any formation of intrusive
igneous rock; rock formed from
magma that cools...
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