"KIDS HOME STUDY REFERENCE DICTIONARY HOME WORD: ionosphere

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i·on·o·sphere  audio 
(-n-sfîr)  See the pronunciation key 

NOUN:
A region of the earth's atmosphere where ionization caused by incoming solar radiation affects the transmission of radio waves. It extends from a height of 70 kilometers (43 miles) to 400 kilometers (250 miles) above the surface.


OTHER FORMS:
i·ono·spheric(Adjective)
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