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Volcanic Activity

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Describe each feature associated with volcanic activity. Describe the characteristics and how it is related to volcanic activity for the following: magma, intrusive structure, extrusive structure, igneous rock, geothermal energy, and lava.

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Describes the characteristics and how it is related to volcanic activity for the following: magma, intrusive structure, extrusive structure, igneous rock, geothermal energy, and lava.

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1. Describe each feature associated with volcanic activity. Describe the characteristics and how it is related to volcanic activity for the following.

a. Magma

Magma is molten rock located beneath the surface of the Earth that often collects in a magma chamber. Magma may contain suspended crystals and gas bubbles. By definition, all igneous rock is formed from magma.

A magma chamber is a large underground pool of molten rock lying under the surface of the earth's crust. The molten rock in such a chamber is under great pressure, and given enough time and pressure can gradually fracture the rock around it creating outlets for the magma. If it finds a way to the surface, then the result will be a volcanic eruption; consequently many volcanoes are situated over magma chambers. Magma chambers are hard to detect, and most of the known ones are therefore close to the surface of the Earth, commonly between 1 km and 10 km under the surface. In geological terms this is extremely close to the surface, although in human terms it is considerably deep underground (http://en.wikipedia.org/wiki/Magma).

b. Intrusive structure

In geology, an intrusive structure is a body of igneous rock that has crystallized from a molten magma below the surface of the Earth. Bodies of magma that solidify underground before they reach the ...

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