In geology, bedrock is solid rock that lies under loose material (regolith) within the crust of Earth or another terrestrial planet.
Herbert Marcuse (en.wikiquote.org) Herbert Marcuse (July 19, 1898 – July 29, 1979) was a prominent German-American philosopher and sociologist of the Frankfurt School.
The various kinds of broken and weathered rock material, such as soil and subsoil, that may overlie the bedrock are known as regolith.