U.S. Geological Survey Sees 18 Volcanoes as 'Very High Threat'
A farmer walks through a thick cloud of volcanic ash. (Photographer: Ragnar Axelsson/Bloomberg)

U.S. Geological Survey Sees 18 Volcanoes as 'Very High Threat'

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(Bloomberg) -- A new U.S. Geological Survey national volcanic threat assessment identified 18 volcanoes as a "very high" risk. The threat assessment reviewed 161 active volcanoes in the U.S. and di...
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