____________ commonly serves as a protolith in the formation of slate.
A)Limestone
B)Sandstone
C)Shale
D)Slate

Question

Quizplus · Accepted Answer

Shale is the best choice as it is a fine-grained sedimentary rock that is easily transformed into slate through pressure and heat. Limestone and sandstone can also be metamorphosed into slate, but they do not commonly serve as a protolith for its formation. Slate cannot be a protolith for its own formation as it is already a metamorphic rock.

____________ Commonly Serves as a Protolith in the Formation of Slate