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Volcano's Deadly Warning

Anatomy of a Volcano

 

Intro | Ash | Lava flow | Lava dome | Lava |  Vent  | Tephra | Caldera | Lahar | Fissure | Dike | Magma

Volcano's Deadly Warning homepage

Vent
Diagram of a volcano

Vent
Vents are openings in the Earth's crust from which magma and volcanic gases escape onto the ground or into the atmosphere. Vents may consist of a single, circular-shaped structure, a large elongated fissure and fracture, or a tiny ground crack. The release of volcanic gases and the eruption of molten rock result in a wide assortment of edifices, ranging from enormous shield volcanoes and calderas to fumaroles and small hornitos.

Left: Steam rises from a vent on Mount Asahidake, a volcano on Hokkaido, Japan.

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