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

Question

Quizplus · Accepted Answer

According to the question, we need to list the rocks in the order of increasing grain size and increasing grade of metamorphism. 
- Slate has the smallest grain size and lowest metamorphic grade. 
- Phyllite has a slightly larger grain size and a slightly higher metamorphic grade than slate. 
- Schist has the largest grain size and the highest metamorphic grade among these three rocks. 
Therefore, the correct order is slate → phyllite → schist. 
Among the options, only option B (slate, phyllite, schist) lists the rocks in this order.

Which of the Following Lists the Rocks in the Order