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Advection fog forms when

  • A.air is lifted rapidly over a mountain barrier
  • B.the ground cools rapidly on a clear calm night
  • C.warm moist air moves over a colder surface
  • D.cold air moves over a much warmer surface

Answer: C

The air is chilled from below until it reaches saturation, and the fog can persist while the flow continues. The last option describes radiation fog instead, which forms by a quite different route. Wind that would disperse radiation fog is what sustains the advection kind.

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