To have my students better understand why animals burrow in the sand during the day we did this simple experiment. Just add some sand to a flower container and put it under a desk lamp. Turn it on first thing in the morning. By the end of the day have students feel the warm sand. Also have some sand that you do not put under the light and have students feel the difference.
My students also had the opportunity to answer this question: How do desert plants live on very little water? This is a great activity for students. You can purchase this experiment at TPT and TN for just $1.