Mt. St. Helens/Eruption

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The May 18, 1980, eruption sent an ash plume over 15 miles into the atmosphere. Prevailing winds carried the ash plume to the northeast, where it turned daylight to darkness over 120 miles away (photo by USGS).


The May 18, 1980, eruption sent an ash plume over 15 miles into the atmosphere. Prevailing winds carried the ash plume to the northeast, where it turned daylight to darkness over 120 miles away (photo by USGS).