An amazing spectacle. Etna spews smoke rings, breaks records
The rare phenomenon, called volcanic vortex rings, is created by a combination of the rapid release of gas and the shape of the eruption. Smoke rings emanate from a new crater that opened on Mount Etna on Tuesday. Photo: AP Amazing spectacle: Etna spews smoke rings, breaks records. Volcanologist from the National Institute of Geophysics … Read more