weather theoryFAA-published question bank (Private Pilot, 2008)
The development of thermals depends upon
A
a counterclockwise circulation of air.
B
temperature inversions.
C
solar heating.✓ Correct Answer
Explanation
Thermals are rising columns of air created when the sun heats the ground unevenly and the warmed surface heats the air above it (PHAK Chapter 12, Glider Flying Handbook). Temperature inversions suppress thermals rather than create them, and counterclockwise circulation describes low-pressure systems, not thermal formation.
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