Which of the following lists the rocks in the order of increasing grain size and increasing grade for regionally metamorphosed mud rocks?
A) slate, schist, phyllite
B) schist, slate, phyllite
C) phyllite, slate, schist
D) slate, phyllite, schist

Question

Quizplus · Accepted Answer

The correct order for increasing grain size and metamorphic grade for mud rocks is slate, phyllite, schist. Slate forms under the lowest grade of metamorphism, followed by phyllite with a slightly higher grade and larger grain size, and schist forms under even higher grade conditions with larger grains.

Which of the Following Lists the Rocks in the Order