what is atmosphere ?
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An atmosphere is a layer or a set of layers of gases surrounding a planet or other material body, that is held in place by the gravity of that body. An atmosphere is more likely to be retained if the gravity it is subject to is high and the temperature of the atmosphere is low.
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The blanket of air surrounding the Earth's surface is known as atmosphere. It atmosphere is composed of many gases like Nitrogen (78%),
Oxygen (21%) . Together these two gases make up 99%. The rest 1% consists carbon dioxide, ozone,argon,water vapour,pollen grains,dust particles,etc.
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