Coastal & Marine Geology InfoBank

USGS CMG InfoBank: Volcanic Domes


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Comment: 14:07 - 14:44 (00:37)

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

Keywords: "volcanic dome", "composite volcano", "Mount Saint Helens", eruption, crater, dome, "volcanic ash"

Our transcription: Volcanic domes usually form in the aftermath of powerful explosions at composite cones, such as at Mt. St. Helens in 1980.

A decade after this eruption the new dome continued to grow inside the volcano's crater.

One of the greatest hazards associated with explosive volcanism is dense clouds of hot ash, which roar down volcanic slopes into low lying areas, sometimes at well over a hundred kilometers per hour.

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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/12.01.16.html Page Contact: InfoBank staff Page Last Modified: Fri Sep 18 02:37:01 PDT 2009 (wcs)