VOLCANO INFORMATION

Many volcanoes occur on islands, near boundries where two oceananic plates collide. The older denser plate dives under the other plate creating deep-ocean trench. The lower plate sinks beneath the deep ocean trench into the asthenosphere. There it begins to melt to foarm magma.

Magma rises until it reaches the surface or until it becomes trapped beneath layers of rock.

during a volcanic eruption the gases dissolve in magma rushes out carrying the magma with them. Once magma reaches the surface and becomes lava the gases bubble out.

Beneath a volcano magma collects in a pocket called a magma chamber. The magma moves through a pipe a long tube in the ground that connects the magma chamber to earth's surface. Molten rock and gas leave the volcano through an opening called a vent. A lava flow is the area covered by lava as it pours out of a vent. A crater is a bowl-shaped area that may foarm at the top of a volcano around the volcano's central vent.

 

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