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Bedrock

Bedrock Exposures, Bedrock Features, Bedrock Distribution

Bedrock is the solid rock that is exposed at the earth's surface, or buried beneath one or more layers of loose sediment. It is of igneous, sedimentary or metamorphic origin and forms the upper surface of the rocky foundation that composes the earth's crust.

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Science EncyclopediaScience & Philosophy: Ballistic galvanometer to Big–bang theory