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Which global air mass shift results when polar amplification weakens thermal gradients?

A)Decreased mid-latitude cyclogenesis events
B)Poleward expansion of Hadley cells
C)Strengthened polar vortex formation shift
D)Equatorward displacement of Walker circulation

💡 Explanation

Hadley cell expansion occurs from weakened arctic temperature gradients impacting air pressure, which influences upper-level wind patterns through the Coriolis effect; therefore, the Hadley cells move poleward, rather than the altered cyclogenesis caused by other atmospheric mechanisms.

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