Mt. Saint Helens blew up with a force 20,000 times greater than the Hiroshima atom bomb. Understanding Volcanoes: Mt. Saint Helens More Videos Online

Understanding Volcanoes: Mt. Saint Helens

Mt. Saint Helens blew up with a force 20,000 times greater than the Hiroshima atom bomb.

Added: Apr 6, 2006
Views: 85025 Views
Runtime: 03:22

 
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