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Answer:

Concrete is the most widely used construction material in the world. ... “A natural process in the caldera produces lime and forms concrete-like rocks by mixing it with ash – the same volcanic ash that Romans used.” That mixing creates rock that is compositionally similar to Roman concrete, but stronger.

Answer:

Romans used volcanic ash and mixed it with lime to make this iconic material,” she explained. “A natural process in the caldera produces lime and forms concrete-like rocks by mixing it with ash – the same volcanic ash that Romans used."