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What type of volcano is Mount St. Helens?

Q: What type of volcano is Mount St. Helens?

A: Mount St. Helens is a composite volcano (or Stratovolcano). According to the United States Geological Survey (USGS), the composite volcanoes are built of layers of alternating lava flow, ash and blocks of unmelted stone.

Where is Mount St. Helens located?

Mount St. Helens is located in Skamania County, Washington, in the Pacific Northwest region of the United States.  Mount St. Helens is located around 80 km northeast of Portland, Oregon and 154 km south of Seattle, Washington.

When did Mount St. Helens erupt?

Over the last 500 years, Mount St. Helens has had at least four major explosive eruptions and many minor eruptions. In 2005, Mount St. Helens released a column of smoke and ash nearly six miles high.

Mount Saint Helens had its major eruption on May 18, 1980, becoming one of the greatest volcanic explosions ever recorded in North America. At least 57 people were killed during 1980 Mount St. Helens volcanic eruptions.

In Octoer 2018, Mount St. Helens was ranked as no. 2 on the US Geological Survey's report of the most threatening volcanoes in the United States. 

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