Mount St. Helens

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Mount St. Helens

Mount St. Helen's the day it erupted - May, 18, 1980

The 1980 Eruption ofMount St. Helens

This is Mount St. Helens the day before its eruption in May, 1980.

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Mount St. Helens is located outside of Seattle. Washington ' Portland, Oregon.

Earthquakes and volcanic eruptions often happen at the same time because of the movement of the tectonic plates.The Mount St. Helens volcano was created by the Earth's tectonic plates pushing together. When tectonic plates slide past each other, magma can be pushed towards the surface of the Earth and out through a volcano. If a volcano has not erupted for a long time the pipe within the volcano may have become blocked with hard lava. If that happens, the pressure of magma being pushed upon it will increase until it is strong enough to push the plug out of the volcano conduit. That means an explosive and violent volcanic eruption and this is what happened with Mount St. Helens.

Mount St. Helens is a volcano located 95 miles outside of Seattle, Washington and 50 miles outside of Portland, Oregon in the Pacific Northwest. It is the most active volcano in the Cascade Range. In May of 1980, it had its most violent eruption following a 5.1 magnitude earthquake. That earthquake triggered the largest landslide in Earth's history. It was this landslide that depressureized the volcano's magma system triggering powerful eruptions.

This is a diagram of the different parts of a volcano.

When the continental plates of the earth shift, a volcano is formed.


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