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Mount St. Helens erupted often between 1980 and 1986. An explosive eruption on March 19, 1982, sent pumice and ash 9 miles (14 kilometers) into the air, and resulted in a lahar (the dark deposit on th...
LMY25T03_2HJCNH1

Mount St. Helens erupted often between 1980 and 19...

Eruption of Mt St Helens 18 May 1980, Gifford Pinchot National Forest An optimised / enhanced version of a USDA Forest Service photo. Credit USDA
LMY25T03_2JAPFPD

Eruption of Mt St Helens 18 May 1980, Gifford Pinc...