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Smoke rings, composed of a mixture of smoke, steam and other gases expelled at high speed, above the Etna on August 09, 2023 in Catania, Italy. The smoke rings, a rare and fascinating sight in recent days, are emitted from a single vent located in one of its most active craters. Etna's volcanic activity seen during a training session of the SAGF, the mountain rescue team of the Italian Guardia di Finanza, from Nicolosi, which operates on the highest active volcano on the Eurasian plate. (Photo by Fabrizio Villa/Getty Images)
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