Image: Pyroclastic Flow St. Helens
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Pyroclastic_Flow_St._Helens.jpg (600 × 410 pixels, file size: 174 KB, MIME type: image/jpeg)
Description: U.S. Geological Survey scientist examines pumice blocks at the edge of a pyroclastic flow from the May 18, 1980 eruption.
Title: Pyroclastic Flow St. Helens
Credit: United States Geological Survey - http://vulcan.wr.usgs.gov/Volcanoes/MSH/Images/MSH80/framework.html#pyroclastic_flows
Author: Donald A. Swanson
Usage Terms: Public domain
License: Public domain
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