How is it that, though the Earth is very hot inside, there is always ice at the poles?
The hot outer and inner core of the earth is hundreds of miles below, hence, the hot temperature can no longer be felt except in near volcanic areas.
The crust has cooled in thousands of years of evolution so heat of the core inside does not reaches to the top. The reason of ice is that the sun rays do not directly fall on these areas so the ice does not melt.
Between the hot interior of the earth and the surface there is a cooled crust, through which enough heat does not penetrate to keep the surface above freezing point. The heat of the surface is derived almost entirely from the sun, and is not sufficient to melt the polar ice during the short polar summers.
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