what is atmosphere ?????
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An atmosphere is the layer of gases surrounding a planet. Many planets (and a number of moons) have atmospheres; some are thicker than Earth's (like Venus) and some are thinner (like Mars).
Atmospheric structure:-About 99% of the total atmospheric mass is concentrated in the first 20 miles (32 km) above Earth's surface.
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An atmosphere is a layer of gases surrounding a planet or other material body that is held in place by the gravity of that body.
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