If the ice of polar cap melts how will it affect the duration of day
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It becomes water and dries due to sunlight
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Earth rotates about its polar axis. When ice melts the mass concentrated near the axis of rotation spreads out. Therefore the moment of inertia increases. As no external torque is acting so, angular momentum is conserved. With increase in inertia, time increases i.e. length of the day increases.
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