Limestone is a sedimentary rock composed largely of the minerals calcite and/or aragonite, which are different crystal forms of calcium carbonate (CaCO<sub>3</sub>). Limestone was formed from the remains of organisms that lived in ancient seas. The Peak District (England) has a large limestone area. Limestone is partially soluble, especially in acid, and therefore forms many erosional landforms. These include limestone sidewalks, pot holes, cenotes, caves and gorges.
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