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Metamorphism can also be divided into prograde and retrograde metamorphism

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Metamorphic grade: is a general term for describing the relative temperature and pressure conditions under which metamorphic rocks form.

Metamorphic facies is a given set of metamorphic conditions,

External processes are responsible for transforming solid rock into sediment and are therefore a basic part of the rock cycle.

The ultimate source of energy for external processes is the Sun.