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Grass meadow in the mountains
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This map shows historical volcanic activity and its hazards over the past 10,000 years in the U.S. Red triangles represent volcanoes. Light orange areas have lower volcanic hazard while dark orange means higher volcanic hazard. Light grey areas have lower ash fall hazard and dark grey areas have a higher ash fall hazard. Sources: USGS, National Atlas.

Volcano Hazard Map

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