Fumaroles are formed only when steam and hot gases are expelled from small vents, usually found on volcanoes.
fumaroles
The volcano is an active one; now (I visited the island in September 2010) only some fumaroles with sulphur, carbon dioxide, water vapour.
fumaroles
fumaroles
fumaroles
In its elemental form it condenses our of volcanic gasses escaping from fumaroles.
== == Fumaroles are vents from which volcanic gases escape. == ==
Fumaroles are steam vents. There is no true opposite.
These are typically called fumaroles, and can occur along cracks or fissures in the ground.
fumaroles
fumaroles
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The volcano is an active one; now (I visited the island in September 2010) only some fumaroles with sulphur, carbon dioxide, water vapour.
fumaroles
fumaroles
fumaroles
fumaroles