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The 1980 Mt. St. Helens eruption sent ash into the air to a height equivalent to 30 Sears Towers. #NatureUnleashed: http://tinyurl.com/5uc5tvw

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1449 days ago

The 1980 Mt. St. Helens eruption sent ash into the air to a height equivalent to 30 Sears Towers. #NatureUnleashed: http://tinyurl.com/5uc5tvw

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ontsciencectr 1448 days ago

July 22, 1980: The eruption of Mount St. Helens, showing an elutriate cloud from pyroclastic flow rising through cloud layer.

Copyright United States Geologic Survey; Photo by Jim Vallance