Image Collection | Types and Features | Fissure Vents
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Fissures are elongate vents that produce a range of activity from lava fountaining and lava flows to more explosive events. The volume and extent of resulting lava flows varies greatly. Vents may be kilometers long and the eruption center may change locations throughout an eruption, with different lava flows impacting different areas. As activity is focused in a particular area, spatter ramparts and cones may form. Hazards include lava flows, volcanic gas, ballistic ejecta, volcanic ash, and pyroclastic flows (also called pyroclastic density currents).