Answer :
Limestone forms either as biochemical or chemical sedimentary rocks. Biochemical limestone forms in marine environments from the accumulation of shells and organismal skeletons, while chemical limestone forms directly from the precipitation of calcium carbonate in aqueous environments like within caves.
Limestone is a sedimentary rock that can be formed in two ways, either as a biochemical or a chemical sedimentary rock.
Biochemical limestone forms in warm, shallow marine environments through the accumulation of shells and skeletal fragments of marine organisms - a process that involves the precipitation of calcium carbonate from the ocean’s calcium bicarbonate. The resulting sediments over geological time, become compacted and turn into limestone.
In terms of Chemical Limestone, this forms from the precipitation of calcium carbonate directly from aqueous environments, often as a result of changes in temperature, pressure or chemistry, such as in the case of stalactites and stalagmites formations in caves. Therefore, the environment in which they form ranges from ocean floors to caves.
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