This is a fairly simple lab for students, but a great introduction to the earthworm. It allows students to observe earthworms and their habits. I have my students do this lab before we do the earthworm dissection. I get the earthworms from a biological supply company and then put them in my garden when we were finished with them. Students seem to love this lab. Since it is so short I often allow my students to continue observing their worms for the rest of the class period. They often develop their own experiments (within reason)with their worms which is interesting to watch.