chemosphere

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che·mo·sphere

 (kē′mə-sfîr′, kĕm′ə-)
n.
The region of the atmosphere from 30 to 190 kilometers (20 to 120 miles) above the earth's surface, in which photochemical reactions initiated by solar radiation occur.

chemosphere

(ˈkɛməˌsfɪə)
n
(Physical Geography) meteorol a rare name for thermosphere
chemospheric adj

che•mo•sphere

(ˈki məˌsfɪər, ˈkɛm ə-)

n.
the region of the atmosphere most characterized by chemical, esp. photochemical, activity, starting in the stratosphere and including the mesosphere and perhaps part of the thermosphere.
[1945–50]
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