Explain with reason that if ice melts at polar region then moment of inertiaof earth increaes, angular velocity `omega` decreases and the duration of the day becomes longer.

Explanation

If ice in the polar region melts, the resulting water willflow towards the equator and consequently moment of inertia of earh will increase because more mass has accumulated at equator which is at more distant from the rotational axis as compared to the poles.
So, from law of COAM if I increases then `omega` decreases.
Time period `(T)=(2pi)/(omega)rArr T` increases.
Due to increase in time period, the duration of day and night will increase.