Discussion
Which structure results from that instability?
Answer: D
The interface rolls up into a regular train of vortices, sometimes made visible by a thin cloud layer and photographed many times. The billows break down into turbulence and mix the layer, which raises the Richardson number and terminates the instability. Convective cells arise from buoyancy alone and are a quite different structure. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.
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