Question

what is true about mountain and valley breezes?
a. mountain breezes happen at night, valley breezes happen during the day.
b. valley breezes and mountain breezes both feature wind blowing upward.
c. valley breezes happen at night, mountain breezes happen during the day.
d. valley breezes feature downward winds, and mountain breezes feature upward winds.

Explanation:

• Mountain Breeze: During the night, the mountain slopes cool faster than the valley floor. The cooler air on the mountain slopes becomes denser and flows down the mountain, creating a mountain breeze (down - slope wind).
• Valley Breeze: During the day, the mountain slopes warm up faster than the valley floor. The warm air on the mountain slopes rises, and cooler air from the valley floor flows up the mountain to replace it, creating a valley breeze (up - slope wind).

Answer:

A. Mountain breezes happen at night, valley breezes happen during the day.