When Mount St Helens erupted in the USA in 1980 - it sent a huge cloud of ash and dust over eleven states. Geologist Dorothy Stoffel was flying directly above the volcano as it blew. Show more
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When Mount St Helens erupted in the USA in 1980 - it sent a huge cloud of ash and dust over eleven states. Geologist Dorothy Stoffel was flying directly above the volcano as it blew. Show more
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