Limestone is any rock that is made mostly from calcium carbonate, but there are several types. It forms with carbonate rocks were deposited in seawater and continue to form as ____. Marine limestone comes together when seawater with high concentrations of chemicals as they dissolve. The surface layer of the material is usually coral, clams, and other sea creatures that use the same chemicals in their shells. The composite of those things merges together and creates the limestone over a period of time.

limestone

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