VOLCANO VORTEX RINGS: Rare volcanic vortex rings were spotted rising above Mount Etna in Italy recently. The natural phenomenon occurs when gases emitted from the volcano ascend rapidly through the ...

Mount Etna in Sicily, the largest active volcano in Europe, has been blowing spectacular “smoke rings” into the sky. The "volcanic vortex rings," a rare phenomenon that is generated by the combination ...

Add Yahoo as a preferred source to see more of our stories on Google. Mount Etna, the rambunctious volcano on the Italian island of Sicily, grumbled back to life on Monday, spewing hot ash and lava in ...

Mount Etna in Sicily, Italy has been drawing attention over the last week as what appear to be “volcanic smoke rings” rise over the island volcano. Locals have reported seeing these rings since April ...

Three-ring circus. The sky over Italy’s Mount Etna fills with ‘smoke rings’ as a newly formed crater puffs out perfect circles of vapour. The circles — called volcanic vortex rings — form when cold ...

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Mount Etna’s craters continue to smoulder two days after its largest eruption in four years sent tourists fleeing from a vast column of gas and ash on Monday. Tourists have returned to the slopes of ...

Air rings blown by dolphins swimming underwater and rings of smoke emitted by jet engines are just two examples of vortex rings. These doughnut-shaped structures and their mesmerizing movement have ...