Bedrock

Bedrock is a term in geology for the solid hard rock underlying loose deposits, such as soil or alluvium. Geologically speaking, bedrock of a planet is the rock that is covered by the layer of unconsolidated solid material called the regolith. Bedrock is sometimes exposed at the surface without a cover.

Bedrock is also fundamental principles on which something else is based, such as bedrock of civilization.

Nearby pages
Bedroll, Bedroom, Bedroom suite, Bedside, Bedsit, Bedskirt