Discussion
Which physical law connects horizontal divergence to vertical motion?
Answer: B
Mass continuity requires that air converging horizontally into a column must leave it vertically, so convergence at low levels implies ascent above. This is the single most used consequence of continuity in synoptic meteorology and it is why surface lows are cloudy and surface highs are clear. Momentum conservation is the equation of motion, energy conservation is the thermodynamic equation, and potential vorticity conservation is a derived result that follows from several of the governing equations combined.
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