Atmosphere
Consists mostly of the troposphere and the stratosphere which comprise the whole mass of air surrounding the Earth. The troposphere is the innermost layer of the atmosphere, containing about 95% of the mass of the Earth’s air and extending 11 miles (17 km) above sea level. The stratosphere is the second layer of the atmosphere and extends from about 11 to 30 miles (17 to 48 km) above the Earth’s surface.
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