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 pressureI 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

Which factor disturbs the equilibrium of rocks, commencing metamorphis

1.	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 pressureI 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» 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.

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