che·mo·sphere (k  m -sfîr , k m-)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
(Earth Sciences / Physical Geography) Meteorol a rare name for thermosphere
chemospheric [ˌkɛməˈsfɛrɪk] adj
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