Discussion
Which level marks the top of the stratosphere?
Answer: A
The stratopause near 50 kilometres is the temperature maximum separating the stratosphere from the mesosphere above. Temperatures there approach 270 kelvin, comparable with the surface, though the pressure is only about one hectopascal. The four pauses, at roughly 11, 50, 85 and beyond, each mark a reversal in the sign of the temperature gradient.
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