== == Fumaroles are vents from which volcanic gases escape.
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Fumaroles are steam vents. There is no true opposite.
Those vents are typically called fumaroles. Fumaroles are openings in the Earth's crust that emit gases, steam, and heat, usually associated with volcanic activity.
These are typically called fumaroles, and can occur along cracks or fissures in the ground.
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Fumaroles are formed when water seeps underground and comes in contact with hot rocks or magma, causing it to heat up and turn into steam. The steam then rises to the surface through cracks or vents in the ground, creating fumaroles. These hydrothermal features are commonly found in volcanic areas or geothermal regions.
The hikers survived the sudden blizzard on Mount Rainier due to the warmth provided by the fumaroles. Fumaroles are openings in the Earth's crust that emit steam and gases, which can create a warm microclimate even in freezing conditions. By seeking shelter near the fumaroles, the hikers were able to stay warm and avoid hypothermia, ultimately surviving the harsh weather conditions.
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In its elemental form it condenses our of volcanic gasses escaping from fumaroles.
Some fumaroles with sulfur deposition around - in September 2010. The last erruption was in 1950.
I was in the island Nea Kameni on 24 September 2010; some fumaroles with sulfur depositions around. See also the link.