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Unformatted text preview: Helens. I found some additional facts which I found interesting about Mount St . Helens. Mount St . Helens is the most active out of all the cascades volcanoes. The lateral blast swept out of the north side of MSH at 300 miles per hour creating a 230 square mile fan shaped area of devastation reaching a distance of 17 miles from the crater. With temperatures as high as 660 degrees F and the power of 24 megatons of thermal energy, it snapped 100 year old trees like toothpicks and stripped them of their bark. The snow on Mount Saint Helens was not instantly flashed to steam by the heat. The snow was melted and formed large mudflows that destroyed 27 bridges, 200 homes, 185 miles of roadway, and 15 miles of railway. Sites Used http://www.wcu.edu/as/GeosciencesNRM/Geology/cherylwt/L07EarthStr&Tect-140H.pdf http://www.meteo.mcgill.ca/195-250/2008/html/volcanoes/img59.html...
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This note was uploaded on 03/07/2009 for the course GEOL 20 taught by Professor Steidl during the Winter '08 term at UCSB.
- Winter '08