Use the words and formulae below to complete the following passage about limestone and its uses.

Limestone is a very common rock. The main chemical in limestone is _________ carbonate (chemical formula, _________ ). Limestone is obtained from _________ . The uses of limestone are many and varied. For example, because it is easy to cut into blocks it is useful as a _________ material. Also it will react with _________ and so it is used in the powder form to reduce soil _________ . When limestone is heated very strongly, it breaks down into __________ (chemical name, calcium _________ ) and carbon dioxide (chemical formula, _________ ). This kind of reaction is known as _________ decomposition.

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