The thermosphere extends from an altitude of ________ to the base of ________ at ________?
- A. 75 km, Mesosphere, 670 km
- B. 80 km, Ionosphere, 680 km
- C. 85 km, Exosphere, 690 km
- D. 90 km, Ozone Layer , 690 km
Explanation
In the simplified atmospheric model used here, the thermosphere begins near 85 km and extends to about 690 km, where the exosphere begins. Atmospheric boundaries are gradual and can vary slightly by reference source.
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