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call call health care and water air contains many lcomposition of the approximate percentage of the different gases present in the given figure carbon dioxide 0.03% of the air is carbon dioxide it is used by green plants to make their own food by the process of photosynthesis oxygen about of about 21% of air is Oxygen living living things needs oxygen to breathe it is required for opening Excel detergent about 78% of there is nitrogen it is important for the growth of the plants water vapour water vapour hydrogen origin and helium a sum sum of the other gases present in the environment properties of air occupy space is Axis pressure is it has weight atmosphere the layer of air around the earth is called atmosphere of your train.com mesosphere thermosphere exosphere are the five main layer of the atmosphere where is the first years above the Earth's surface changes in the weather rockers in the player troposphere stratosphere in the second layers of the atmosphere is ozone layer which protects us from harmful rays in the present