Volcanic vortex rings (VVR) are a rare phenomena generated by the combination of rapid gas release and the vent shape of a volcano.
Smoke ring over Mount Etna, Sicily, Ital, August 2023 [Source Wikicommons, Author: Jpakkala]
Smoke ring over Mount Etna, Sicily, Ital, c.1970 [Source Wikicommons, Author: Angelosalemi]
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