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Date: 2014-11-06 17:20:14Crater Glacier Cascade Range Lava dome Types of volcanic eruptions Volcanology St. Helens Volcanic activity of Mount St. Helens David A. Johnston Mount St. Helens Geology Physical geography | Add to Reading ListSource URL: mshinstitute.orgDownload Document from Source WebsiteFile Size: 1,91 MBShare Document on Facebook |