volcanic ash

noun Geology.
ash ( def 2 ).

Origin:
1790–1800

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Volcanic ash is always a great word to know.
So is ninnyhammer. Does it mean:
a fool or simpleton; ninny.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
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Example sentences
Researchers also use the application to display the movement of volcanic ash
  clouds, which can pose a serious threat to airplanes.
Everyone in an ash fall zone will be exposed to the effects of volcanic ash.
And the layers of volcanic ash built up over millennia dampen any shaking.
Thanks to fine volcanic ash, however, this spider was squashed without breaking
  up its delicate exoskeleton.
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