Mount Saint Helens

The Pacific Northwest is one of the most beautiful areas in America. It is filled with some of the most breathtaking mountains people can not imagine. Looking at them, I think that it was a mountain that grew up in the geological age, but that is not the only thing. Indeed, many are volcanoes. The most popular is Mount St. Helens. Metric ton. St Helens is located in the southwestern part of Washington State, 50 miles northeast of Portland, Oregon. It is one of the summits of the cascading mountains in the northwest Pacific coast.

Introduction: The project area I decided to study is Mount St. Helens. Mount St. Helens is in Scamania County, about 50 miles northeast of Portland, Oregon, where I am from. Mount St. Helens is an important mountain for those familiar with it due to the massive eruption that occurred in the spring of 1980. Mount St. Helens is located in the west side of Washington and can always be seen in Portland as a beautiful landmark. The mountain has high altitude

According to researchers, Mount St. Helen has been active for at least the past 18000 years. As can be seen from the literature of the 1840s and 1850s, during this time St. Helens Mountain was very active. One of the first eruptions of Mount St. Helens in 1842 was a Methodist missionary of Willamette Valley (Harris, 1988). According to J. L. Parrish, after the volcanic eruption of 1842, Mount St. Helens is known to have erupted for several weeks or months through the winter (Harris, 1988). Many other settlers and missionaries recorded the occurrence of mountains and volcanic eruptions throughout the winter from 1842 to 1842. St. Helens Mountain was active until 1857. It was the last eruption before 1980 (Harris, 1988).

Mount St. Helens is a good example of a diving volcano. It was still active at the last eruption of 1981. In the case of St. Helens mountain, it is also part of the volcanic arc, cascade. This arc was formed by subduction of the San Juan plate under the North American plate. We made a series of mountains ranging from Mount Garibaldi in British Columbia to Mount Shasta in California. Plate tectonics is the driving force for all volcanic activities. In the northwestern Pacific coast, the Juan de Fuca plate subducted below the North American plate. Because of high pressure, the edge of the subducting plate melts into the magma. Since magma has low density and buoyancy, it enters the ground from weak parts of the Earth's crust (Carson, 2000). When magma reaches the top, it erupts to the surface and causes volcanic activity