Verified Answer :

Shales that are subject to heat and pressure of metamorphism alter into a hard, fissile, metamorphic rock known as slate. With continued increase in metamorphic grade the sequence is phyllite, then schist and finally to gneiss.

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The kind of metamorphic rock formed from shale is known as  gneiss

Option b is correct

What metamorphic rock formed from shale?

Metamorphic rocks can simply be defined as a set of rocks that is formed by extreme heat or pressure while forming.

Therefore, Metamorphic rocks are known as slates. as metamorphic grade increase we have phyllite, then schist, and gneiss.

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