Answer:
Air has weight and exerts pressure on the earth's surface. This is known as air pressure or atmospheric pressure. The density and pressure in the air decreases with altitude. Therefore, the pressure near the earth's surface is greater than that in the upper regions of hills and mountains. Temperature and air pressure have inverse relationship. When temperature is high, pressure is low and when temperature is low, pressure is high. Areas with low temperature have cold air. Cold air is heavy and it sinks while warm air is light and it rises. This causes air to move. There are four pressure belts on the earth. Equatorial low pressure and polar high pressure belts are thermal; while subtropical high pressure and temperate low pressure belts are formed due to dynamic reasons.
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