If heat rises, then why is it colder in the sky?

Because the warm air rises and expands-which makes it cooler. It also losses its ability to hold heat.

I just learned that. :D 哈哈 We learn something new everyday!

Excellent question! I have no idea! This 问题 is a real head scratcher ~LOL~

I'm pretty sure it's colder in the sky because the cold from 太空 comes down and cools off the heated air. Either that 或者 because the atmosphere cannot contain heat and allows some of it out... That 或者 possibly because the heat expands everywhere and 你 can't feel it anymore... That's my best guess.

Hmmm Only God knows why...

I don't know I was never good at Science, only Math and Choir

GRAPE!!!!!!