blue mud

blue mud

noun Geology, Oceanography.
a deep-sea sediment of fine silt and clay that derives its bluish color from organic material and iron sulfide.

Origin:
1830–40, Americanism
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Blue mud is always a great word to know.
So is leaching. Does it mean:
rich soil containing a relatively equal mixture of sand, silt and a smaller proportion of clay
to dissolve out soluble constituents from ashes and soil by percolation
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