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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 |
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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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