The atmosphere is generally about air and nitrogen, oxygen and argon together constitute the major gas of the atmosphere. The refractive index of the air is just closer and greater than 1. UV radiation are absorbed by the atmosphere and a dry air by its volume contains 78.09% of nitrogen, 20.95% of oxygen and 0.039% carbon di oxide. dust, pollen, spores, sea spray, volcanic ash and industrial pollutants are also present in the atmosphere. Exo, Thermo, Meso, Strato and Tropho sphere are the different layers of atmosphere and these are arranged from highest to lowest.
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