This fog forms in valleys at night.
A) advection fog
B) steam fog
C) radiation fog
D) precipitation fog

Question

Quizplus · Accepted Answer

Radiation fog forms during clear, calm nights when the ground cools rapidly by radiation, and the cool air near the ground causes the moisture in the air to condense into fog. This fog forms in valleys because the cool air is denser and settles in low-lying areas. Advection fog occurs when warm, moist air moves horizontally over a cool surface, steam fog occurs when cold air moves over relatively warmer water, and precipitation fog is from warm rain or drizzle falling through a colder layer of surface air.

This Fog Forms in Valleys at Night