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The atmosphere is made up chiefly of three gases - Nitrogen (~79%), Oxygen (~20%) and Argon (~1%).

The atmosphere is also made up of other gases such as carbon dioxide, water vapour, neon, helium, xenon, krypton, radon, methane and ammonia.

There is also ozone in the ozone layer, which protects us from much of the UV radiation from the sun.

Many chemicals have been put into the atmosphere by us. These include CFCs (Chlorofluorocarbons), HFCs (Hydrofluorocarbons), PFCs (Perfluorocarbons), sulphur dioxide, nitogen oxides, carbon monoxide and carbon particulates.

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