The difference in valley and mountain breeze?

Answer 1

see below

Warm air rises and attracts air from the valley during the day because it is lighter than cold air, and because high mountains have larger thermal excursions (differences in temperature between night and day) than plains due to rarefied air and generally lower water vapor content. At night, however, because mountain temperatures drop more quickly than valley temperatures, the breeze originates from the mountains in the early morning and from the valley during the day.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.