ash fall

noun Geology.
1.
a rain of airborne ash resulting from a volcanic eruption.
2.
the deposit produced by such an event.
Also, ashfall.
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Example sentences
Forty-seven were rescued from the south side of the volcano, where there was
  neither a blast surge nor a heavy ash fall.
Such activity would result in far-reaching eruption clouds and ash fall.
Pyroclastic flows and extensive ash fall are usually produced during these
  events as well.
Everyone in an ash fall zone will be exposed to the effects of volcanic ash.
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