Definition of Atmosphere
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the envelope of gases surrounding the earth.
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The atmosphere is the layer of gas that surrounds Earth. It is often called air. Other planets, and some of their larger moons, also have atmospheres.
The atmosphere consists of several different gases. The gases are held close to Earth by a force called gravity. Near Earth’s surface, the atmosphere is about three fourths nitrogen and one fifth oxygen. At higher elevations, the atmosphere is mostly hydrogen and helium.
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