Natural concrete keeps lid on Italian volcano

Scientists explain how ground rose 2 meters without bursting


SET IN CONCRETE  Naturally occurring concretelike rock allowed the ground around the volcanic Campi Flegrei caldera in Italy to rise a couple meters without bursting, new research finds. Cracks in the nearby rock (shown) vent gas and heat from deep underground.

DamienOz/Flickr (CC BY-ND 2.0)

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