Coastal & Marine Geology InfoBank

USGS CMG InfoBank: Oceanic Lava's Source


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Comment: 14:31 - 14:59 (00:28)

Source: Annenberg/CPB Resources - Earth Revealed - 2. The Restless Planet

Keywords: volcano, mantle

Our transcription: Even today more than four and a half billion years after the formation of the Earth, there are two layers of the planet that remain molten or partially molten.

The uppermost mantle beneath the crust is now solidified, but a zone beneath it several hundred kilometers thick approaches the temperature of melting.

This is where the lava in most oceanic volcanoes comes from.

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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/02.01.23.html Page Contact: InfoBank staff Page Last Modified: Fri Sep 18 02:35:36 PDT 2009 (wcs)