Coastal & Marine Geology InfoBank

USGS CMG InfoBank: Composite Volcanoes


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Comment: 06:45 - 07:19 (00:34)

Source: Annenberg/CPB Resources - Earth Revealed - 13. Volcanism

Keywords: volcano, "composite volcano", eruption, "lava flow", "convergent plate", "Pacific Ocean", "oceanic hot spot", "divergent plate", flow

Our transcription: Some volcanoes at sea, together with the great majority of volcanoes on dry land, lie along convergent plate boundaries, such as those that encircle the Pacific Ocean.

Volcanoes in convergent plate settings tend to erupt more explosively than those at hot spots and along divergent boundaries.

They are called "composite volcanoes" because they are made of alternating layers of lava flows and explosively erupted fragments.

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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/12.01.07.html Page Contact: InfoBank staff Page Last Modified: Tue Dec 16 06:31:02 PST 2008 (wcs)