Fumarole

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Sulfureous fumaroles at the Solfatara crater, one of the 24 craters of the Phlegraean Fields, Naples

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Fumaroles near the summit on Mount Damavand, Iran

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Sulfureous fumaroles on Whakaari/White Island, New Zealand

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Fumaroles in Nisyros, Greece

A fumarole (Latin fumus, smoke) is an opening in the crust of the Earth, often in the neighborhood of dormant volcanoes, where steam and gases come out, for instance carbon dioxide, sulfur dioxide, hydrochloric acid, and hydrogen sulfide.

Etymology

The name solfatara (from the Italian solfo, sulfur), is given to fumaroles with sulfurous gases.