1.To adjust the temperature of the earth to suit the living, that is, usually during the day with the sun. The air surrounding the earth will help to absorb heat from the sun partially makes the world is warm.The cooling air to help make the world to cool down. Without the air surrounding the earth and during the day, the temperature on the earth's surface to reach about 110 degrees Celsius. And during the night the temperature on the earth's surface will drop to about - 180 C
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