Fumarole!

FUMAROLE

it is an opening in earth's crust , often in the neighbourhood of volcanoes, which emits steam & gases such as carbon dioxide, sulfur dioxide, hydrocloric acid & hydrogen sulfide. the name solfatare , from the italian solfa sulfur, is given to fumaroles that emit sulfurous gases.fumarole may occur along tiny cracks or long fissures, in chatic clusters or fields & on the surface of lava flows & thick deposites of pyroclastic flows. a fumarole field is an area of thermal springs & gas vents are releasing gases or interacting with groung water from the perspective of ground water. fumarole could be described as a hot spring that boils off call its water before the water reaches the surface example famous valley of ten thousand smokes , which was formed during the 1912 erruption of novarupta in alaska.