Discussion
Assertion (A): The étage boundaries are quoted differently for tropical and polar regions.
Reason (R): The depth of the troposphere itself varies considerably with latitude.
Answer: A
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason is the cause. Clouds are confined to the troposphere, and the tropopause stands at about 18 kilometres over the equator and 8 or so over the poles. The étages are therefore defined as fractions of that depth rather than as absolute heights, so a cloud at 8 kilometres is high-level in the temperate zone and middle-level in the tropics.
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