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New page: thumb|300px|Eruptive fissure on southeast rim of Kilauea caldera, Hawaii.In geology, a '''fissure''' is a fracture or crack in rock along which there is a distinct sep...
[[Image:Fisure.jpg|thumb|300px|Eruptive fissure on southeast rim of Kilauea caldera, Hawaii.]]In geology, a '''fissure''' is a fracture or crack in rock along which there is a distinct separation; fissures are often filled with mineral-bearing materials. On volcanoes, a fissure is an elongate fracture or crack at the surface from which lava erupts. Fissure eruptions typically dwindle to a central vent after a period of hours or days. Occasionally, lava will flow back into the ground by pouring into a crack or an open eruptive fissure, a process called drainback; sometimes lava will flow back into the same fissure from which it erupted.
[[Category:Geology]]
[[Category:Geology]]