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In geology and related fields a stratum is a layer of sedimentary rock or soil or igneous rock that were formed at the earths surface .

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Metamorphic rock can be formed by any other type of rock sedimentary or igneous.

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Sedimentary Rock is one of the three main rock groups and is formed in 4 main ways.

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They are formed by the cooling of molten magma on the earths surface

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The rock cycle is the basic concept geology that describes the time consuming transitions  through geologic time among  the three main rock.