The most commonly occurring type of metamorphic rocks are gneiss and ________.
A) magma
B) shale
C) coal
D) schist
E) none of the above

Question

Quizplus · Accepted Answer

Gneiss and schist are commonly occurring types of metamorphic rocks, with schist having a higher metamorphic grade than gneiss. Magma is not a type of metamorphic rock, but rather a molten rock. Shale is a sedimentary rock, while coal is a sedimentary rock formed from organic matter.

The Most Commonly Occurring Type of Metamorphic Rocks Are Gneiss