Consult the figure below.Compared to low-grade metamorphic rocks,high-grade rocks ____________.

A)always contain more quartz and feldspar
B)are produced closer to the surface,high in the stratigraphic column
C)are produced at greater temperatures and pressures
D)are produced at cooler temperatures,but greater pressures

Question

Consult the figure below.Compared to low-grade metamorphic rocks,high-grade rocks ____________.

A)always contain more quartz and feldspar 
B)are produced closer to the surface,high in the stratigraphic column 
C)are produced at greater temperatures and pressures 
D)are produced at cooler temperatures,but greater pressures

Quizplus · Accepted Answer

High-grade metamorphic rocks are produced at greater temperatures and pressures compared to low-grade rocks. The mineralogy of the rock is dependent on the original rock type and the metamorphic conditions, so there is no guarantee that high-grade rocks will always contain more quartz and feldspar. The location where the metamorphic rock forms in the stratigraphic column is not related to the grade of metamorphism.

Consult the Figure Below