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Smoke Rings
via the New Scientist Picture of the Day for May 25
"A rare sight was witnessed at Iceland's Eyjafjallajökull volcano recently when it let off this smoke ring. Caught on camera by volcano hunters and photographers Donna and Steve O'Meara, the ring of steam and gas rose into the atmosphere for a few minutes before dissipating.
Other active volcanoes around the world, including Stromboli and mount Etna in Italy, have blown smoke rings too. In 2000 Etna went through a spectacular phase that lasted several months when one of its vents created hundreds of smoke rings each day.
It's not clear how the rings form, but it is thought that they require a vent with a narrow, circular mouth, and the expulsion of gas in individual puffs at just the right velocity."
Video of some of the Etna smoke rings below
"A rare sight was witnessed at Iceland's Eyjafjallajökull volcano recently when it let off this smoke ring. Caught on camera by volcano hunters and photographers Donna and Steve O'Meara, the ring of steam and gas rose into the atmosphere for a few minutes before dissipating.
Other active volcanoes around the world, including Stromboli and mount Etna in Italy, have blown smoke rings too. In 2000 Etna went through a spectacular phase that lasted several months when one of its vents created hundreds of smoke rings each day.
It's not clear how the rings form, but it is thought that they require a vent with a narrow, circular mouth, and the expulsion of gas in individual puffs at just the right velocity."
Video of some of the Etna smoke rings below
Click to view