The seasons are caused by the fact that the Earth is titled and part of the year the northern half of the globe is tilted toward the sun and the other part of the year the southern half is tilted toward the sun. Also the Earth is round so where as the sun’s rays hit the equator directly they hit the North and South Poles indirectly. These two factors mean that during the winter (i.e. when it is tiled awy from the sun) at either pole the sun doesn’t shine for several months and during the summer the sun shines for several months without setting. So either of the poles will have the most extreme changes in temperature between summer and winter.
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