Explain with reason why if ice melts at pole then moment of inertia of earth increases, angular velocity `omega` decreases and day night will be longer?

Explanation

If ice of he pole melts then it will come towards the equator and moment of inertia of earth will increase because mass particle at equator are at more distance from rotational axis as compare to pole.
Time period `(T)=(2pi)/(omega)` (`:'Iomega=` constant)
So if I increases then `omega` decreases. Hence T will be increased.
Due to increment of time period, the duration of day and night will increase.