volcano
volcanic fissure
https://en.wikipedia.org/wiki/Volcanic_fissure
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SWEETRealm:Fissure
ENVO
fissure vent
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A linear volcanic vent through which lava erupts, usually without any explosive activity. The vent is usually a few meters wide and may be many kilometers long. Fissure vents can cause large flood basalts and hannels. The volcano can usually be seen as a crack in the ground or on the ocean floor. Narrow fissures can be filled in with lava that hardens.
fissure