1. The earth is spherical in shape. So, the sun’s rays fall unevenly on the earth’s surface. The Polar regions receive slanting sun’s rays. Hence there is little or no sunlight, thus there is an extreme cold winters.
2. Temperature varies with time due to changes in the level of radiation which reach the earth surface. This is due to motions of the earth (The rotation and revolution) and inclination of the earth’s axis.
3. As you go up in an airplane, the atmospheric pressure becomes lower than the pressure of the air inside your ears. Your ears pop because they are trying to equalize or match the pressure.
