Coastal & Marine Geology InfoBank

USGS CMG InfoBank: Intrusion


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Comment: 03:59 - 04:17 (00:18)

Source: Annenberg/CPB Resources - Earth Revealed - 14. Intrusive Igneous Rocks

Keywords: magma, intrusion, plutonic, igneous

Our transcription: The ascent of magma is a process called "intrusion".

If the magma cools underground, it forms an intrusive, sometimes called, plutonic igneous rock.

If it erupts at the surface, the igneous rock is called "extrusive" or volcanic.

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U.S. Department of the Interior \| U.S. Geological Survey URL: http://walrus.wr.usgs.gov/infobank/programs/html/school/moviepage/13.01.04.html Page Contact: InfoBank staff Page Last Modified: Wed Aug 27 06:15:19 PDT 2008 (wcs)