When Mount Saint Helens erupted back in 1980, 250 million tons of ash were released into the atmosphere, which spread far enough that the sky in Spokane, 250 miles away, was completely blackened. Detectable amounts of ash covered 22,000 square miles, with the ash being 10 inches deep 10 miles downwind of the blast and 1 inch deep 60 miles downwind. The ash’s total volume was 0.26 cubic miles.
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