Cooling of a surface overnight that chills the air layer directly above that surface may form
A) an advection fog.
B) an upslope fog.
C) an evaporation fog.
D) a radiation fog.

Question

Quizplus · Accepted Answer

When a surface cools overnight, it can chill the air layer directly above it through radiation cooling. This cooled air can cause water vapor in the air to condense, forming a fog. This type of fog is called a radiation fog, so the correct answer is option D. Advection fog forms when warm, moist air moves horizontally over a cooler surface. Upslope fog forms when moist air flows up a slope and cools, forming fog. Evaporation fog forms when cold air passes over a warm water surface and the moisture from the water evaporates, condenses and forms fog.

Cooling of a Surface Overnight That Chills the Air Layer