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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

Lava dome
Diagram of a volcano

Lava dome
Lava domes are rounded, steep-sided mounds built by magma that is highly resistant to flow, usually either dacite or rhyolite. Such magmas are typically too viscous to move far from the vent before cooling and crystallizing. Domes may consist of one or more individual lava flows.

Left: An aerial view of the 600-foot lava dome in the crater of Washington's Mt. St. Helens, as seen between the May and July eruptions in 1980.

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