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troposphere vs. stratosphere

[ trop-uh-sfeer, troh-puh- ]
  1. the lowest layer of the atmosphere, 6 miles (10 km) high in some areas and as much as 12 miles (20 km) high in others, within which there is a steady drop in temperature with increasing altitude and within which nearly all cloud formations occur and weather conditions manifest themselves.
[ strat-uh-sfeer ]
  1. the region of the upper atmosphere extending upward from the tropopause to about 30 miles (50 km) above the earth, characterized by little vertical change in temperature.
  2. (formerly) all of the earth's atmosphere lying outside the troposphere.
  3. any great height or degree, as the highest point of a graded scale.

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