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flag Mount Etna, Europe's largest active volcano, has been producing rare "smoke rings" or "volcanic vortex rings" since last week.

flag Mount Etna, Europe's largest active volcano, has been producing rare "smoke rings" or "volcanic vortex rings" into the sky since last week. flag The phenomenon occurs when rapid gas release combines with the unique vent shape of a new crater that opened on Etna's summit, not causing any disruption in the surrounding villages or Catania airport. flag No other volcano on Earth produces as many vapor rings as Etna.

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