"KIDS HOME STUDY REFERENCE DICTIONARY HOME WORD: exosphere

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ex·o·sphere  audio 
(ks-sfîr)  See the pronunciation key 

NOUN:
  1. The outermost region of a planet's atmosphere.
  2. The outermost layer of the earth's atmosphere, lying above the thermosphere and extending thousands of kilometers into space, from which molecules having sufficient velocity can escape the earth's gravitation.


OTHER FORMS:
exo·spheric(Adjective)
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