Limestone is used to make buildings and is used as a base for roads.
It is mostly made of calcium carbonate which is an importnat raw material used in the production of glass, cement and concrete.
It is heated when making cement and glass. The heat decomposes the Calcium Carbonate (CaCO3) in it to form Calcium Oxide (CaO) and Carbon Dioxide (CO2). This process is called Thermal Decomposition.
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