Europe's most active volcano, Mount Etna, is blowing scores of ethereal "vortex rings" every day from a single vent located in one of its most active craters.
On July 23, Boris Behncke, a volcanologist with Italy's National Institute of Geophysics and Volcanology who is based in Sicily alongside Mount Etna, wrote on Twitter that the volcano had been "releasing dozens of gas rings" from a single vent in Bocca Nuova crater for around a week and shows no signs of stopping.
