The hill arreas are cool as if they receive sunlight first from sun   But plains have more heat than the mountains. Why?I want to know since the moutains receive sunlight first and later the...

The hill arreas are cool as if they receive sunlight first from sun   But plains have more heat than the mountains. Why?

I want to know since the moutains receive sunlight first and later the plains receive sunlight. But plains are very hot and mountains are cool. How it happened. Because both are receiving sun rays from the same sun. Kindly clarify.

Expert Answers
haglunde eNotes educator| Certified Educator

The air temperature at high altitudes is cooler than at lower elevations (such as the plains) because the air is less dense, or has a lower atmospheric pressure, in the mountains and therefore is less able to retain the heat generated by the sun.  As the sun heats the earth and water these surfaces radiate the heat into the air and at higher elevations the air expands and cools more rapidly due to the lower atmospheric pressure.  The temperature actually decreases by 3°F per 3,000 ft of elevation gain as a consequence of this low air pressure.