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