Question

Why the mountains are cooler than plains

Answer 1

Answer:

because of their(mountains) high altitudes..

Answer 2

$\bf\huge\underline\mathtt\orange{Answer}$

It so because, firstly, the air on the mountains is rare than that on the plains and absorbs less heat than the air on the plains, secondly the heat absorbed during the day on the mountains radiates away more quickly due to the rarity of the air, thirdly, major portion of the mountains remains in shade.