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Magma is liquefied rock, viscous rather than "plastic" (as in the rheid of the hot mantle). Magma can form within the lithosphere, in locations such as subduction zones, continental rift zones, mid-ocean ridges, and hotspots above the mantle.

* The pressure in the mantle is too high for rock to become liquid. In the outer core, the heat becomes high enough to form liquid, but this dense liquid can never reach the surface of the Earth.

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