Which of the following are Metamorphic rocks?
A
Gneiss and Mafic
B
Gneiss and Schist
C
Schist and Mafic
D
Schist and Chalk
Correct Answer: Gneiss and Schist
Schist and gneiss are produced by medium to high grade metamorphism. In some cases gneisses are produced by higher grade metamorphism than schists. Low-grade metamorphic rocks tend to be fine-grained (the newly formed metamorphic mineral grains that is). High-grade metamorphic rocks tend to be coarse-grained.