_:b1216964 "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."^^ . _:b1216964 "Wikipedia:Fissure_vent"^^ . _:b1216964 . _:b1216964 . _:b1216964 .