Discussion
Which physical origin does the pressure gradient force ultimately have?
Answer: B
Unequal solar heating creates horizontal temperature contrasts, which through the hydrostatic relation create horizontal pressure contrasts, which drive the wind. That chain is the fundamental energy pathway of atmospheric motion. Rotation shapes the resulting circulation but supplies no energy, friction dissipates it, and latent heat release, though a powerful amplifier in storms, is itself a consequence of motion that the solar heating started.
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