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Magma ChamberA magma chamber is the chamber beneath a volcano where the magma is held before an eruption. It is the build up of pressure in this chamber that causes the eruption. Often, a volcano may have a deep magma chamber many kilometres down, which supplies a shallower chamber near the summit. The location of magma chambers can be mapped using seismology: waves from earth tremors move more slowly through liquid rock than solid, allowing measurements to pinpoint the regions of slow movement which identify magma chambers.
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