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Roman Concrete Mimicked Resistant Volcanic Rock

Roman concrete, one of the world's most durable compounds, closely resembles the rock formed in the depths of a dormant supervolcano in Italy.

Published On 07/09/2015
2:00 PM EDT
Solfatara is a shallow volcanic crater at Pozzuoli, near Naples, part of the Campi Flegrei volcanic area. | ThinkStock