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The exosphere contains most of the satellites orbiting Earth.The thermosphere is the second-highest layer of Earth's atmosphere.

Several layers can be distinguished in the atmosphere, based on characteristics such as temperature and composition.By volume, dry air contains 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.04% carbon dioxide, and small amounts of other gases.Air also contains a variable amount of water vapor, on average around 1% at sea level, and 0.4% over the entire atmosphere.Air content and atmospheric pressure vary at different layers, and air suitable for use in photosynthesis by terrestrial plants and breathing of terrestrial animals is found only in Earth's troposphere and in artificial atmospheres.The atmosphere has a mass of about 5.15 three quarters of which is within about 11 km (6.8 mi; 36,000 ft) of the surface.

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The three major constituents of air, and therefore of Earth's atmosphere, are nitrogen, oxygen, and argon.