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Pronunciation varies by accent · noun
The region of the Earth's atmosphere (from 20 to 120 miles above the surface) in which photochemical reactions take place..
Use chemosphere when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Chemosphere means The region of the Earth's atmosphere (from 20 to 120 miles above the surface) in which photochemical reactions take place..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use chemosphere where its definition matches the intended context.
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