what is atmosphere and air
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The atmosphere of Earth is the layer of gases, commonly known as air, retained by Earth's gravity, surrounding the planet Earth and forming its planetary atmosphere. ... Air also contains a variable amount of water vapor, on average around 1% at sea level, and 0.4% over the entire atmosphere.
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the gaseous envelope surrounding the earth; the air: a weather balloon rising high into the atmosphere. this medium at a given place: the warm, dry atmosphere of the Joshua tree's natural environment. Astronomy.
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