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The thermosphere extends from an altitude of ________ to the base of ________ at ________?
A75 km, Mesosphere, 670 km
B80 km, Ionosphere, 680 km
85 km, Exosphere, 690 km
D90 km, Ozone Layer , 690 km
Correct Answer: C. 85 km, Exosphere, 690 km
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