Fumaroles are steam vents. There is no true opposite.
"Ozone" has no antonym.
Polonium is an element and has no antonym.
An antonym for transparent is "Dark".
the antonym of stable is unstable
A decilitre is a measure of volume and does not have an antonym.
== == Fumaroles are vents from which volcanic gases escape. == ==
Fumaroles are formed only when steam and hot gases are expelled from small vents, usually found on volcanoes.
These are typically called fumaroles, and can occur along cracks or fissures in the ground.
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In its elemental form it condenses our of volcanic gasses escaping from fumaroles.
fumaroles
The antonym of the word 'synonym' is 'antonym'.