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Private Pilot Licence (PPL) – Canada · Question

Which type of fog forms when warm, moist air moves over a colder surface?

Advection fog forms when warm, moist air flows horizontally over a cooler surface, cooling the air to its dew point. This is common along coastal areas.

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Question: Which type of fog forms when warm, moist air moves over a colder surface?

Answer options:

  • Radiation fog ✅ Advection fog
  • Upslope fog
  • Steam fog

Correct answer: Advection fog

Explanation: Advection fog forms when warm, moist air flows horizontally over a cooler surface, cooling the air to its dew point. This is common along coastal areas.

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