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507 - FAA PPL(A) USA - The conditions necessary for the formation of cumulonimbus clouds are a lifting action and:

Question 507 - Preflight Preparation - FAA PPL(A) - Private Pilot Airplane

unstable air containing an excess of condensation nuclei
either stable or unstable air
unstable, moist air

Training tests and timed exam simulations FAA PPL(A) - Private Pilot Airplane