During a field study, students notice that air flows from the valley floor up to the slopes every noon. Which atmospheric condition causes this pattern?
Uneven heating of mountain slopes
During the day, the mountain slopes receive direct sunlight and heat up faster than the valley floor, which lies in relatively shaded and cooler conditions.
The warm air above the heated slopes becomes lighter and rises upward. To replace this rising air, the cooler and denser air from the valley floor flows up along the slopes, producing a daytime wind known as the valley breeze.
Earth's rotation causes large-scale winds, not this local daily pattern, and uniform heating or sudden rainfall cannot create the steady upslope flow observed at noon.
Hence, the correct answer is Uneven heating of mountain slopes.
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