Article: atmosphere

atmosphere [Gr.,=sphere of air], the mixture of gases surrounding a celestial body with sufficient gravity to maintain it. Although some details about the atmospheres of other planets and satellites are known, only the earth's atmosphere has been well studied, the science of which is called meteorology .

Components and Characteristics of the Earth's Atmosphere

The first 40 to 50 mi (64-80 km) above the earth contains 99% of the total mass of the earth's atmosphere and is generally of a uniform composition, except for a high concentration of ozone, known as the ozone layer , at 12-30 mi (19-50 km). Calculated according to their relative volumes, the gaseous constituents of the ...

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