mantle rock

noun

, Physical Geography.

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

Word History and Origins

Origin of mantle rock¹

First recorded in 1890–95

Example Sentences

This mantle rock is so thick and so irregularly disposed that it has given origin to small hills and ridges.

From Project Gutenberg

With these residuary soils of the driftless area, the mantle rock of glaciated tracts is in sharp contrast.

From Project Gutenberg

The glaciated and unglaciated areas differ notably in topography, drainage, and mantle rock.

From Project Gutenberg