troposphere

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trop·o·sphere / ˈträpəˌsfi(ə)r; ˈtrō-/ • n. the lowest region of the atmosphere, extending from the earth's surface to a height of about 6–10 km (the lower boundary of the stratosphere).DERIVATIVES: trop·o·spher·ic / ˌträpəˈsfi(ə)rik; -ˈsferik; ˌtrō-/ adj.

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