Enlarged view

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	This diagram shows buildings of the kind that the ancient Greeks and the ancient Romans used. The main stone they used was limestone. A hard kind of limestone is called marble. It was only used in the expensive buildings because it was difficult to shape.

This diagram shows buildings of the kind that the ancient Greeks and the ancient Romans used. The main stone they used was limestone. A hard kind of limestone is called marble. It was only used in the expensive buildings because it was difficult to shape.