Europe's Largest Volcano Puffs Perfect Smoke Rings Into Sky

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Europe's Largest Volcano Puffs Perfect Smoke Rings Into Sky

Europe's most active volcano, Mount Etna, put on a spectacular show this weekend. It exhaled a series of near-perfect circles, resembling smoke rings or even a fleet of giant spaceships peacefully drifting across the sky. Scientists have a more down-to-earth explanation for this phenomenon. These are "volcanic vortex rings," formed by the rapid release of gas and vapor from a new crater on Mount Etna. "The rings look pretty much like the 'smoke …