Introduction:
The Earth's atmosphere is in continuous motion: movement which is attempting to balance the constant differences in pressure and temperature between different parts of the globe. It is this motion which carries water from the ocean to the continents to provide precipitation and moves heat energy from the tropical regions toward the poles, warming the high latitudes. It is this circulation which plays a basic part in maintaining a steady state in the atmosphere and generating the climatic zones which characterise different parts of the earth.
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