what is atmosphere ? what is the composition of air in the atmosphere
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Atmosphere: the envelope of gases surrounding the earth or another planet.
The air in Earth's atmosphere is made up of approximately 78 percent nitrogen and 21 percent oxygen. Air also has small amounts of lots of other gases, too, such as carbon dioxide, neon, and hydrogen.
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The atmosphere is the blanket of gases which surrounds Earth. It is held near the surface of the planet by Earth's gravitational attraction. Without the atmosphere there could be no life on Earth.Air is present in water and soil. Air is a mixture of nitrogen, oxygen, carbon dioxide, water vapour and a few other gases. Some dust particles may also be present in it. Oxygen supports burning and is necessary for living organisms
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