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6 October, 14:25

Why does magma in the mantle rise through the crust above it

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  1. 6 October, 15:26
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    Currents from the lava
  2. 6 October, 15:36
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    Magma rises from the mantle because it is more buoyant than the surrounding rocks. This occurs when gas dissolved in the magma forms bubbles, reducing its density and causing it to well upward. If the magma finds a vent, or the pressure cracks the crust, it can reach the surface.
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