puffs

Mount Etna volcano puffs giant rings of gas, photos and videos show

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Mount Etna, Europe’s largest active volcano, puffed out a string of near-perfect rings over the weekend — prompting comparisons to smoke rings, or a fleet of giant flying saucers floating gently into the blue sky. Etna formed the “volcanic vortex rings,” as they are known to scientists, through the rapid release of gas and vapors … Read more