volcanic ash

volcanic ash

noun Geology.
ash (def. 2).

Origin:
1790–1800
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Volcanic ash is always a great word to know.
So is infiltration. Does it mean:
seepage of water into soil or rock
rich soil containing a relatively equal mixture of sand, silt and a smaller proportion of clay
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