The transformation of high-grade metamorphic rocks into low-grade metamorphic rocks is termed ________ metamorphism.
A) foliated
B) prograde
C) retrograde
D) dynamic

Question

Quizplus · Accepted Answer

Retrograde metamorphism refers to the transformation of high-grade metamorphic rocks into low-grade ones due to a decrease in temperature and pressure. This process usually occurs after the peak of metamorphism has passed. Foliated metamorphism refers to the alignment of minerals in a rock due to directed pressure, while prograde metamorphism refers to the increase in temperature and pressure that causes the transformation of low-grade rocks into high-grade ones. Dynamic metamorphism occurs due to mechanical deformation, such as that which occurs during faulting or shearing.

The Transformation of High-Grade Metamorphic Rocks into Low-Grade Metamorphic Rocks