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Blowing ‘smoke’: Mount Etna puts on a show by emitting rare rings into the sky

Tourists in Italy have been treated to quite the show as Europe’s largest active volcano, Mount Etna, has been spewing spectacular “smoke rings” into the sky since last week. The unusual phenomenon, known as a “volcanic vortex ring,” is caused by a combination of rapid outgassing and the shape of a vent erupting from a […]