Define atmosphere..
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The thick gaseous envelope of air surrounding the earth from its surface that extends up to an altitude of 10,000 km is known as the atmosphere. ... This layer of the atmosphere has created four layers by nitrogen, helium and hydrogen with respect to their atomic weight.
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Atmosphere refers to the gases surrounding a star or planetary body held in place by gravity. A body is more likely to retain an atmosphere over time if gravity is high and the temperature of the atmosphere is low.
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