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Mount Etna, one of the most active volcanoes in the world, is known for this phenomenon. Here is how it is formed. Also, do the rings mean the volcano is about to erupt? Read on.
One volcanologist said Mount Etna was spewing "unprecedented quantities" of the volcanic vortex rings – potentially because of "so much bad news" happening lately.
News and eruption updates about Etna volcano, Italy
Redoubt emitting a large steam plume in April 2009. Image courtesy of Calvin Hall. A few snippets from the world of volcanoes:
The final part of Etna Week, brought to us by guest blogger Dr. Boris Behncke. Check out Part 1 and Part 2 as well! Etna Volcanic hazards By guest blogger Dr. Boris Behncke.