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troposphere
The troposphere is the lowest portion of Earth's atmosphere. It contains approximately 75% of the atmosphere's mass an almost all of its water vapor and aerosols.
Trivia about troposphere
Nearly all of the Earth's weather occurs in this layer of the atmosphere below the stratosphere
The jet stream is found in this layer of the atmosphere
Almost all weather takes place in this lowest part of the atmosphere
Most weather occurs in this lowest level of the atmosphere, which extends to an altitude of 6 to 10 miles