A carbonate is a chemical compound that contains the carbonate ion, which is made up of one carbon atom and three oxygen atoms, represented as CO3^2-. These compounds are commonly found in nature, often forming minerals like calcite and dolomite. Carbonates play a crucial role in the Earth's carbon cycle and are important for various geological processes. In everyday life, carbonates are present in many substances, including baking soda and limestone. They are used in industries such as construction, where limestone is a key ingredient in cement. Additionally, carbonates can affect the acidity of water, making them significant in environmental science.