INTRUSION

Intrusion

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 formations.

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intrusion

Noun

  1. The forcible inclusion or entry of an external group or individual; the act of intruding.
  2. Magma forced into other rock formations; the rock formed when such magma solidifies.


The above text is a snippet from Wiktionary: intrusion
and as such is available under the Creative Commons Attribution/Share-Alike License.

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