Question

what is troposphere????????

Answer 1

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here is your answer..
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The troposphere is the lowest layer of Earth's atmosphere, and is also where nearly all weather conditions take place. It contains approximately 75% of the atmosphere's mass and 99% of the total mass of water vapor and aerosols. 
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Answer 2

The lowest layer of Earth's atmosphere and very close to Earth,In this region all weather vonditions takes place,I t contain approx. 80 percent of total mass of atmosphere.