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Earth's atmosphere is composed of about 78% nitrogen, 21% oxygen, and one percent other gases. These gases are found in layers (troposphere, stratosphere, mesosphere, thermosphere, and exosphere) defined by unique features such as temperature and pressure.
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The average rate of decrease of the temperature of normal air with the increase in height. It is equal to 3.5°F/1000 ft or 6.5°C/km.
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Atmosphere is very importantfor sustaining life: It contains variousgases like O2, CO2, N2 which are required for various life processes by plants and animals. (ii) gas is used by plants to prepare food by the process called photosynthesis (iii) Oxygen is required for burning, combustion and
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