Mount St. Helens Essay

607 WordsOct 13, 20143 Pages
A volcano is a vent in the crust of the Earth from which molten or hot rock and has explosively violent potential. Volcanoes are important to us because they create new land. The land around a volcano is very fertile and has important and valuable minerals in the soil. Also, their geothermal power can be converted into an alternative energy source. This paper will be about Mount St. Helens. Mount St. Helens is an active stratovolcano located in Skamania County, Washington, in the Pacific Northwest region of the United States. It is 96 miles south of Seattle, Washington, and 50 miles northeast of Portland, Oregon. It is in the Cascade Range which is a major mountain range of western North America. The Cascade Range extends from southern British Columbia through Washington and Oregon to Northern California. It is a part of the Cascade Volcanic Arc. Mount St. Helens has the most seismically active volcanoes in the Washington and Oregon Cascades. In an average month, 22 events are located by the Pacific Northwest Seismic Network, with the number going far higher during eruptive periods. Mount St. Helens lies on a Convergent boundary plate. These are the most geologically active plate, the mountain lies mainly on the Continental crust of the Convergent boundary plate. Mount St. Helens is 8,366' or 2,550 m high. The radius of Mount St. Helens is about 6 km at the base, and the elevation of the base is about 1 km above sea level. Before the eruption of May, 1980, the elevation at the top of Mount St. Helens was about 3 km. Mount St. Helens is a composite volcano (or stratovolcano), a term for steep sided, often symmetrical cones constructed of alternating layers of lava flows, ash, and other volcanic debris. Composite volcanoes tend to erupt explosively and pose considerable danger to nearby life and property. Mount St. Helens last eruption was from October 2004 to

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