Question

Which factor disturbs the equilibrium of rocks, commencing metamorphism?

(a) Increase in temperature

(b) Decrease in temperature and pressure

(c) Increase in temperature and pressure

(d) Decrease in pressure

I have been asked this question by my school principal while I was bunking the class.

This interesting question is from Source and Classification of Stones in section Materials for Construction of Basic Civil Engineering

Answer 1

Right choice is (c) Increase in temperature and pressure

Explanation: Rocks are stable at a temperature below 200°C and at the pressure existing. Any increase in above two factors can initiate the process of metamorphism. One factor alone is not sufficient to start metamorphism.