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Definition of magma chamber in English: magma chambernoun A reservoir of magma within the earth's crust beneath a volcano. Example sentencesExamples - It could also be that magma is somehow able to pass through the volcano without deforming it; or that the magma chamber is so deep that its deformations aren't visible at the surface.
- The gist of the finding is that under the earth, the magma chambers do not consist of molten magma alone, but solid crystals are also found there.
- The size and depth of these magma chambers can be determined by mapping the earthquake activity around them.
- When magma moves beneath a volcano, such as when the magma chamber fills prior to an eruption, there is swelling of the volcanic cone above.
- The frequent but low-level activity of Vesuvius in recent centuries has relieved the build-up of pressure in the magma chamber.
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