Because the sunlight barely strikes those places. As the Earth is shaped as oblique spheroid  it is tilted at a certain angle.Sometimes Polar region experience 6 months of sunlight and 6 months of darkness

did you copy me....
un lang kung hidi mo ako nireport hindi ko rin gagawin yun sabi nga nila kung ayaw mong gawin sayo wag mong gawin sa iba!!!!!!!!!!!!!!!!Mikai 14 seconds ago
nope i was first than you look at the time duration

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Because they receive less amount of heat.....