Discussion
Which flow is described as anticyclonic in the northern hemisphere?
Answer: A
Anticyclonic means rotating in the sense opposite to the local vertical component of the Earth's rotation, which is clockwise in the northern hemisphere and anticlockwise in the southern. The final option states the definition correctly in words but then applies it to the Earth as a whole rather than to the local vertical, which reverses the answer in the southern hemisphere. Anchoring the definition to the local vertical avoids that trap entirely. Most errors here come from carrying a result across from a neighbouring case where it does not hold.
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