At high pressures and elevated temperatures of regional metamorphism, silicate rocks are more resistant to flowage and deformation than at low temperatures and pressures.

Question

Quizplus · Accepted Answer

At high pressures and elevated temperatures of regional metamorphism, silicate rocks become more plastic and are more easily deformed, as the increased temperature reduces their viscosity and the pressure makes the formation of new minerals and the realignment of mineral grains more likely.

At High Pressures and Elevated Temperatures of Regional Metamorphism, Silicate