Largest active volcano in Europe blowing rare 'smoke rings'

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