bedrock

definition

Bedrock is the solid rock that underlies looser surface material.

erosion

Bedrock can be eroded through the action of glacial plucking and abrasion, and the resulting clasts of various sizes will be incorporated to the glacier’s bed.

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Bedrock (Wikipedia) In geology, bedrock is solid rock that lies under loose material (regolith) within the crust of Earth or another terrestrial planet.

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An exposed portion of bedrock is often called an outcrop.
The various kinds of broken and weathered rock material, such as soil and subsoil, that may overlie the bedrock are known as regolith.

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Wikipedia

Bedrock (Wikipedia) In geology, bedrock is solid rock that lies under loose material (regolith) within the crust of Earth or another terrestrial planet.