Linked from
The 7 pages that link to Fissure vent, each with the reason it gives.
Volcanic ventBroader topic: Some vents are extended fractures rather than compact openings.
VolcanoCompared with: Unlike a central cone, it releases material along an extended opening.
Lava fieldRelated: Fissures can feed broad fields rather than a single cone-centered flow.
São Jorge IslandRelated: Fissure eruptions produced much of São Jorge’s ridge-like form.