Période

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

July 22, 1980 eruption of Mount St. Helens, with Mount Rainier, Washington, in the background. July 22, 1980.
LMY25T03_2HJCP3Y

July 22, 1980 eruption of Mount St. Helens, with M...