Mount St. Helens Essay examples

718 Words Nov 3rd, 2015 3 Pages
Mount St. Helens is located in southwestern Washington in Skamania County. It is 96 miles south of Seattle, Washington, and 50 miles northeast of Portland, Oregon. It is also known as Louwala-Clough, or Lawetlat 'la to the indigenous Cowlitz people, and Loowit to the Klickitat. Mount St. Helens is an active stratovolcano or composite volcano, a steepsided and often symmetrical cone constructe. Thess type of volcanoes tend to erupt explosively and pose considerable danger to nearby life and property of lava flows, ash, and other volcanic debris. Mount St. Helens takes its English name from the British diplomat Lord St. Helens in the late 18th century. The last eruption was on March 20, 1980. A 5.1- magnitude earthquake hit Mount St. Helen from a slumber of 123 years, since 1857 which was witnessed by local tribes. Earthquakes can give scientists a signal to determine if a volcano is becoming active. Earthquakes may be an indication that an eruption is building up; as magma moves up towards earths surface, shifting and breaking rock. The presences of gas at the surface of a volcano that is released from magma within the rock, is another sure sign that an explosive eruption is building. In 1980 on the northside of the mountain, a huge bulge began to grow outwards. At the time scientis were trying to figure out what could cause such a change in the mountain side. By using laser technology to get precisied measurements and mirrors as a reflecter of light, scientis were able to…

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