36 What are characteristics of a moist, unstable air mass?
C. Haze and smoke.
This is not the correct answer.
FAA AC 00-6A, Aviation Weather For Pilots and Flight Operations Personnel has for reasons unknown been cancelled by the FAA.  Which seems odd since weather-related accidents occur too often.  You can buy the book on Amazon or you can download it in PDF form.
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Treetop.Academy is operated by MannMade Digital Video (www.mmdv.com)