Fog often lingers in river valleys because
A) the water in the river cools off faster at night than the land does.
B) cold air sinks into low areas such as river valleys.
C) some evaporation may occur from the river, thereby supplying moisture to the cooler atmosphere.
D) both A and B
E) both B and C

Question

Quizplus · Accepted Answer

Cold air sinks into low areas like river valleys, and evaporation from the river can supply moisture to the cooler atmosphere, both contributing to fog formation.

Fog Often Lingers in River Valleys Because