The thermosphere spans between an elevation of ________ and the lower limit of ________ situated at ________?
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Answer: C. 85 km, Exosphere, 690 km
Explanation
The thermosphere starts above the mesopause at approximately 85 kilometers elevation. It extends upward to the transition zone known as the exosphere. The lower boundary of the exosphere is situated at roughly 690 kilometers altitude. Atmospheric layers are defined by distinct temperature gradients changing with altitude. The thermosphere absorbs high-energy X-rays and ultraviolet radiation from the sun. Temperatures in this high layer can rise dramatically with increased solar activity.
Low Earth orbit satellites operate smoothly within the upper reaches of the thermosphere. Radio communications rely heavily on the ionized particles found throughout this atmospheric region. Understanding atmospheric boundaries helps scientists predict satellite drag and orbital decay accurately. Option A lists incorrect altitude thresholds that do not match standard atmospheric models. Option B incorrectly identifies the intermediate boundary layer as the ionosphere rather than exosphere. Option D incorrectly references the ozone layer which resides much lower in the stratosphere.
- Subject
- Everyday Science
- Category
- Everyday Science
- Topic
- —
- Difficulty
- medium
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