mantle rock

mantle rock

noun Physical Geography.
the layer of disintegrated and decomposed rock fragments, including soil, just above the solid rock of the earth's crust; regolith.

Origin:
1890–95
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Mantle rock is always a great word to know.
So is ninnyhammer. Does it mean:
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
a fool or simpleton; ninny.
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