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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

Magma
Diagram of a volcano

Magma
Magma is molten or partially molten rock beneath the Earth's surface. When magma erupts onto the surface, it is called lava. Magma typically consists of a liquid portion (often referred to as the melt); a solid portion made of minerals that crystallized directly from the melt; solid rocks incorporated into the magma from along the conduit or reservoir, called xenoliths or inclusions; and dissolved gases. Magma collects inside a volcano's magma chamber before it erupts (see diagram).

Left: Magma from the belly of Kilauea in Hawaii collects as it flows out to the Pacific Ocean.

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