Middle-latitude cyclones are fueled by
A. energy from falling precipitation.
B. polar continental air masses.
C. air high up in the atmosphere.
D. the movement of stationary fronts.

Answer :

I am pretty sure that middle-latitude cyclones are fueled by air high up in the atmosphere because such low-pressure areas usually occur in middle latitudes of the Earth and that's it.  This answer will definitely help you. Regards!

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