On a clear, calm night, you would expect the air in a valley to be
A)cooler than that on a hillside.
B)warmer than the air on a hillside.
C)less dense than that in surrounding areas.
D)the same temperature as that in surrounding areas.

Question

Quizplus · Accepted Answer

During clear, calm nights, cold air tends to settle in valleys due to its higher density compared to warm air. This process, known as cold air drainage or katabatic flow, results in cooler temperatures in the valley compared to the air on hillsides.

On a Clear, Calm Night, You Would Expect the Air