The fall or descent of ash from the atmosphere, typically after a volcanic eruption, large fire, or explosion.
From ash (the particles) plus fall (descent); a modern compound word created to describe the phenomenon of ash falling from the sky.
Ashfall is a geological term that became much more common after Mount St. Helens erupted in 1980, raining ash across eleven states—it fundamentally changed how scientists and the public understood volcanic hazards.
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