Discussion
Which force drives convection?
Answer: A
A parcel less dense than its surroundings experiences a net upward force equal to the weight of the air it displaces, and that buoyancy is what drives every convective motion in the atmosphere. The density difference arises from temperature, from humidity through the virtual temperature effect, and from the weight of condensed water. Horizontal convergence supplies mass to the updraught but does not create the buoyancy, and neither the Coriolis force nor friction plays any part in driving the ascent.
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