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Fumarole @ Hverir, Námafjall Geothermal Area, Iceland
A fumarole (or fumerole – comes from the Latin fumus, "smoke") is an opening in a planet's crust which emits steam and gases such as carbon dioxide, sulfur dioxide, hydrogen chloride, and hydrogen sulfide. The steam forms when superheated water condenses as its pressure drops when it emerges from the ground.
