Largest active volcano in Europe blowing rare 'smoke rings' into sky

The largest active volcano in Europe has been blowing spectacular "smoke rings" into the sky since last week.

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Giuseppe Barbagallo ,Boris Behncke ,Reuters ,Natural History Global Volcanism Program ,National Institute Of Geophysics ,Etna Alpine Guides Group ,South Etna Alpine Guides Group ,Mount Etna ,National Institute ,Natural History ,Global Volcanism ,