Mount St. Helens eruption

May 17, 2010
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In this May 18, 1980 file photo provided by the U.S. Geological Survey, Mount St. Helens erupts in Washington state, sending a plume of ash many miles skyward. As the 30th anniversary of the eruption approaches on May 18, 2010, scientists are still learning from studying how the area devastated by the blast continues to recover from the eruption. (AP Photo/USGS, Austin Post, File)

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