July 22, 1980 eruption of Mount St. Helens sent pumice and ash 6 to...
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Detailed Description
July 22, 1980 eruption of Mount St. Helens sent pumice and ash 6 to 11 mi (10-18 km) into the air, and was visible in Seattle, Washington (100 mi/160 km north).
Sources/Usage
Public Domain.