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mantle rock

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noun Physical Geography.

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

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“Was” is used for the indicative past tense of “to be,” and “were” is only used for the subjunctive past tense.

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Origin of mantle rock

First recorded in 1890–95
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

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