from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun 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.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun the region of the
Earth's atmosphere(from 20 to 120 miles above the surface) in which photochemical reactionstake place
from Wiktionary, Creative Commons Attribution/Share-Alike License
chemo- + -sphere
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