The preexisting rock which is subsequently altered to form a metamorphic rock is termed a as Protolith
- Protolith is simply known as the type of rock that was the previous form of metamorphic rock. In metamorphism, mineral content and texture of the protolith are therefore altered as a result of changes that took place in the physical and chemical environment of the rock.
Conclusively we can say that the preexisting rock which is subsequently altered to form a metamorphic rock is termed a as Protolith
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