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How does metamorphic rock change into magma?

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Metamorphic rock is rock changed under pressure and heat (though not tremendous). Magma is rock liquified under tremendous heat and pressure. read more

Metamorphic rock is rock changed under pressure and heat (though not tremendous). Magma is rock liquified under tremendous heat and pressure. Metamorphic rock is rock changeded under pressure and heat, though not tremendous. read more

The usual way this happens is by burial, typically by burial into a subduction zone, which pulls rocks of all sorts down into the upper mantle, where heat and pressure are such that all rocks eventually melt into liquid form, with different minerals in each type of rock melting at different heat and pressure conditions. Bingo: magma. read more

A metamorphic rock doesn't actually change into an igneous rock, as the process of melting results in a melt, which crystallizes into a completely different kind of rock, rather than a gradual transition in form and mineralogy. read more

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