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troposphere
The lowest level of a planetary atmosphere where convection keeps the gas mixed. In the case of Earth's atmosphere, the troposphere extends up to a height of 10 to 16 kilometers, where it meets the tropopause. Its temperature decreases steadily with altitude from about 290 K to 240 K at a rate of about 6.5 K per km. Almost all the atmospheric water vapor and weather systems occur here.
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