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Sediments (sand, clay, boulders etc) are derived from the erosion of preexisting rocks by snow, ice, water and wind. Eventually these sediments settle and are covered by more sediments. As the weight of overlying sediments builds up the pressure and minerals dissolved in and carried by groundwater cement the sediment particles together to form a new rock layer. This new rock is called a sedimentary rock.

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16y ago

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