Volcano - Mount St. Helens

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by OliviaS81
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Volcano - Mount St. Helens

VolcanoMount St. Helens

What are Volcanoes?Volcanoes are vents in the earth's crust through which lava, steam, and ashes are ejected during an eruption.

An EruptionMount St. Helens is most known for its massive eruption on May 18, 1980. Fifty-seven people were killed, 47 bridges, miles of railroads and highways, and lastly 250 homes. An earthquake of 5.1 on the Richter scale triggered a huge avalanche of debris which reduced the elevation of the volcano.

LocationMount St. Helens is in Skamania County, Washington, in the Pacific Northwest region of the United States.

HistoryMount St. Helens started to expand about 36,000 years ago in Pleistocene during the Ape Canyon Stage. In the Cougar Stage, pyroclastic flows of hot pumice and ash occurred. Over the years, there have been many eruptions, but the most destructive one was the one in 1980.

By:Olivia Sieniawski


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