Weather fun!

This is a science experiment I did this week. I put warm water and cold water in different cups and put the yellow water on top of the clear water. Can you tell which is warm by looking?

Warm water always wants to go up and the cold water wants to stay down so it doesn't mix. So the yellow water is warm and stays on top.

This is like weather. Warm air wants to go up and cold air wants to stay down. When the warm air cools it goes down and the cold air goes up and creates wind. Sometimes warm air gets trapped under cold air. They push each other and start spinning and that makes a tornado.