the troposphere
noun/ðə ˈtrɒpəsfɪə(r)/
/ðə ˈtrəʊpəsfɪr/, /ðə ˈtrɑːpəsfɪr/
[singular] (specialist)- the lowest layer of the earth’s atmosphere, between the surface of the earth and about 6–10 kilometres above the surfaceTopics Spacec2Word Originearly 20th cent.: from Greek tropos ‘turning’ + sphere.
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the troposphere