Volcanoes blow smoke rings. Here's how they do it.

These ghostly hoops have been spotted above volcanic events around the world. But how they form has long been a mystery.
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Italy's Campi Flegrei supervolcano is stirring. Could this seismic giant soon erupt?

POZZUOLI, Italy — In Greek and Roman mythology, the Campi Flegrei volcano is depicted as the opening to the underworld. Its prehistoric eruptions blocked out the sun, turning summer into winter and ...

Scientists Think a Volcanic Eruption May Have Kicked Off the ‘Black Death’

A volcanic explosion, somewhere in the tropics, may have increased European trade with central Asia—which brought fleas ...