Why Is It Colder at the Top of a Mountain Than It Is at Sea Level?

Why is it colder at the top of a mountain than it is at sea level? Heat rises, and the top of a mountain is closer to the sun, so shouldn't it be hotter at the top of a mountain?

Does Altitude Affect Rheumatoid Arthritis?

Climate & Weather, HowStuffWorks

Why do many foods have

ELI5: Why is it colder on mountain tops? - Tutor Delphia's Blog

Mountain Habitat

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Why is it colder at higher elevations? A thorough and visual explanation., by Barry Fischer

Effects of Altitude on Water Boiling Time

Effects of Altitude on Water Boiling Time