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the troposphere

noun [S]
 
 
/ˈtrɒp.əs.fɪər/ US  /ˈtrɑː.pəs.fɪr/ specialized

Definition

the layer of gases surrounding the Earth from the surface up to a height of about ten kilometres → Compare the mesosphere, the stratosphereThe Earth and outer space - general words
(Definition of the troposphere noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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