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Limestone itself is a building material. The pyramids in Egypt are made of blocks of limestone.

Limestone is composed mostly of a chemical called Calcium carbonate. When this is heated, it looses a molecule of CO2 and becomes Calcium oxide. Calcium oxide is known as lime. Lime is one of the main ingredients in cement.

Calcium carbonate is basic and increases the pH of either soil or water. Lakes affected by acid rain can be neutralized with the addition of limestone.

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