Coastal & Marine Geology InfoBank

USGS CMG InfoBank: Melting


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Comment: 10:40 - 11:12 (00:32)

Source: Annenberg/CPB Resources - Earth Revealed - 18. Metamorphic Rocks

Keywords: metamorphism, temperature, melting, "igneous rock", "metamorphic rock", geologist, megmatite, granite, burial

Our transcription: In some circumstances, the temperature of a deeply buried rock become so great the rock starts melting.

When this happens, a rock having both igneous and metamorphic features results.

Geologists call these intermediate rock types, "megmatites," or mixed rocks.

In some megmatites geologists find evidence for the origin of one of Earth's most common igneous rocks, granite.

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Accessibility FOIA Privacy Policies and Notices
U.S. Department of the Interior \| U.S. Geological Survey URL: http://walrus.wr.usgs.gov/infobank/programs/html/school/moviepage/17.01.13.html Page Contact: InfoBank staff Page Last Modified: Tue Oct 14 06:07:27 PDT 2008 (wcs)