How does magma get onto the surface of the Earth?
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Magma forms from partial melting of mantle rocks. As the rocks move upward (or have water added to them), they start to melt a little bit. ... Eventually the pressure from these bubbles is stronger than the surrounding solid rock and this surrounding rock fractures, allowing the magma to get to the surface.
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Magma forms from partial melting of mantle rocks. As the rocks move upward (or have water added to them), they start to melt a little bit.
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