Discussion
Statement I: Baroclinic instability arises where surfaces of constant pressure and constant density are inclined to one another, as they are across a strong horizontal temperature gradient.
Statement II: It is the principal mechanism by which mid-latitude cyclones develop.
Answer: D
Correct answer: Both Statement I and Statement II are correct
Baroclinity is precisely the condition in which isobaric and isopycnal surfaces intersect, which is what a horizontal temperature gradient produces. The available potential energy stored in that tilt is released as growing waves, and those waves are the extratropical cyclones of the mid-latitude storm tracks.
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