Question

What is regelation?

(a) Refreezing of ice on addition of impurities

(b) Refreezing of ice on reduction in pressure

(c) Melting of ice at lower temperature than its melting point due to increase in pressure

(d) Melting of ice at higher temperature than its melting point

Answer 1

The correct answer is (b) Refreezing of ice on reduction in pressure

To explain: When increase in pressure causes water to melt. It may refreeze on removal of this extra pressure. This refreezing is called relegation.