Rare pink volcanic vortex rings seen spewing from Italy's Mount Etna 01:04. A rare event was caught on camera over the weekend at Italy's Mount Etna, the most active stratovolcano in the world.

In short: Volcanic vortex rings have formed above Mount Etna in Italy. Volcanologist Ana Casas Ramos says the rings are made of condensed water which forms when hot vapour from the volcano hits ...