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.

1890–95 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Tectonic plates slid and were subducted, mantle rock melted and pooled
  underground, volcanoes erupted.
It reveals the chemical composition of the molten mantle rock that formed the
  seafloor in that region.
Hot water forced through tiny fractures and pores in the mantle rock dissolves
  some silica from the rock into it.
Magma is hot molten rock containing chemical elements from melted mantle rock
  and oceanic plate.
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