Image Collection | Types and Features | Lava Domes
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Lava domes are formed when magma is extruded at a vent and is too viscous to move away from the vent as a lava flow, building a dome or steep spine structure tens to hundreds of meters in height over days or years. Domes can grow over years to decades and can partially collapse to form block-and-ash flows, a type of pyroclastic flow. They may be singular or form a dome complex, sometimes constructing larger volcanic complexes, and span a wide range of compositions. They may also form thick, viscous lava flows. Hazards include dome collapse, pyroclastic flows including block-and-ash flows, ballistic ejecta, volcanic ash, volcanic lightning, lahars, volcanic gas, and rockfalls.