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| a region in the lee of mountains that receives less rainfall than the region windward of the mountains |
| an area within which the air frequently is confined or channeled, with all parts of the area thus being subject to similar conditions of air pollution |
| tropopause (trō'pə-pôz', trŏp'ə-) Pronunciation Key
The boundary between the upper troposphere and the lower stratosphere, varying in altitude from about 8 km (5 mi) at the poles to 18 km (11 mi) at the equator. |