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When Mount St. Helens erupted on May 18, 1980, the top 400 meters (1,300 feet) of the volcano disappeared in a blast that covered more than 390 square kilometers (150 square miles) and sent thousands of tons of ash into the upper atmosphere. This collection of still images and video depict before-and-after scenes of Mount St. Helens and its surroundings, allowing viewers to witness the results of the eruption and revealing the extent of environmental recovery 20 years later. A background essay and list of discussion questions are also provided.
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