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What is the main reason temperature decreases with altitude?

Answer and explanation

Correct answer: Air becomes thinner and cooler at height

As altitude increases, atmospheric pressure generally decreases and the air becomes thinner. The air is heated mainly from the Earth’s surface, not directly by sunlight passing through it. Rising air expands in the lower pressure and cools, so higher places are usually colder than nearby lowlands. This is why mountain regions often have cooler conditions.

Option B is the best answer because it states that air becomes thinner and cooler with height. The wording is a simplified school-level explanation; the cooling is closely linked to expansion of rising air as pressure falls. The sea does not come nearer, the Sun still rises at high places, and rainfall does not always stop there. Therefore, altitude is correctly connected with lower temperature.

Related tags

AltitudeTemperatureMountain Climate

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