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Bedrock is the hard layer of rock beneath looser rocks and soil. In some places, the bedrock is exposed, while in others it lies deep underground. The word combines bed — here meaning "plot of land" — and rock.
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Bedrock is the hard, solid rock beneath surface materials such as soil and gravel. ... Bedrock can extend hundreds of meters below the surface of the Earth, toward the base of Earth's crust. The upper boundary of bedrock is called its rockhead. Above the rockhead, bedrock may be overlain with saprolite.
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