The rock layers in earth are formed by the process of sedimentation by wind, water or chemical weathering. Limestone layers are formed in earth by the precipitation of calcium carbonate from the ocean water.
Calcite, a mineral with the chemical formula CaCO₃, makes up the majority of limestone, a sedimentary rock. It often develops in shallow, warm, quiet, and clear marine environments.
The majority of the time, limestone is a type of biological sedimentary rock that develops as an accumulation of shell, coral, algal, fecal, and other organic waste.
The precipitation of calcium carbonate from lake or ocean water is one example of a chemical sedimentary process that might cause its formation.
The atmosphere of earth in the earlier time was cool without sufficient temperature. When the temperature started to raise by the presence of green house gases the atmosphere set to what we see today.
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