Have you ever thought about life on this earth if there is no air? And have you ever thought that god has created something that is most valuable for human in the form of the air that we breathe is always free and do not need to pay for it? Probably most people do not realize it,the air that envelops of earth consist of several layers of different nature,a layer of air at the earth's surface is called atmosphere,composition of the globally atmosphere are troposphere,ionosphere, stratosphere and also exosphere.
The atmosphere of the earth has very important role for all of life,without the atmosphere there will never be life on this earth,besides the earth will feel very hot during the day and also will feel very cold at night,the atmosphere protects the earth from the threat of collision of celestial bodies such as meteors,meteor coming into the atmosphere layer will be burned and turn into space dust before hitting the earth,air on earth has some element that is in need of the human life,plants,and animals,humans desperately need air for breathing by inhaling through the destination for the purposes of exchange of substances in the body, a lot of air containing dust originating from forest fires,smoke from factories and motor vehicles as well as a sprinkling of salt water over the ocean, the dust can be useful as a condensation nucleus,in the atmosphere,but if large amounts of dust can interfere with vision and health.
Plants was very need of some elements ,especially carbon dioxide and nitrogen,if plant lacks of nitrogen it will cause disturb of growth,nitrogen can't taken up by plants directly from the air but should receive assistance of thunder or lightning ,nitrogen in the air can be brought by the rain water into the soil and nitrogen in the soil can be absorbed by plants through the roots.
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