Mount Etna in Sicily has been blowing spectacular ‘smoke rings’ into the sky since Wednesday. The volcano, which towers over the historic port city of Catania, is the largest in Europe and one ...

Observations of rings above Etna, as well as Italy’s Mount Vesuvius, destroyer of Pompeii, date back to 1724, according to the 2023 study. More recently, vortex rings have also been spotted at ...

The “volcanic vortex rings” are a rare phenomenon generated by the combination of rapid gas release and vent shape. Photo: Giuseppe Di Stefano/Associated Press EU Announces $28 Billion of ...

A DROP of liquid heavier than water, for example blue or red ink, submerged quietly into still water, encounters the resistance of the medium and becomes flatter in its form in the course of its ...