Why is it colder in the uplandsthan the lowlands?

It is colder in the uplands than in the lowlands primarily due to altitude. As elevation increases, the atmosphere becomes less dense, leading to lower air pressure and reduced ability to hold heat. Additionally, the temperature typically decreases by about 6.5 degrees Celsius for every 1,000 meters of elevation gained, known as the lapse rate. Consequently, higher altitudes experience cooler temperatures compared to their lower counterparts.