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Answer:

troposphere is the lowest layer of Earth's atmosphere, and is also where nearly all weather conditions take place. It contains 75% of the atmosphere's mass and 99% of the total mass of water vapour and aerosols.

the troposphere is the tropopause, which is the border between the troposphere and stratosphere.
Answer: The troposphere is the lowest layer of Earth's atmosphere, and is also where nearly all weather conditions take place. It contains 75% of the atmosphere's mass and 99% of the total mass of water vapour and aerosols. ... Most of the phenomena associated with day-to-day weather occur in the troposphere.