How do worms help the soil?

The BEST way to learn about worms is to observe them, of course! Our second grade scientists completed lab booklets, learning that worms prefer damp to dry places, measured the length of an earthworm, looked for a worm's eyes, nose, and teeth, and noticed that they do make tunnels. Some students touched the worms and recorded their observations about what the earthworm does when touched gently. At the end of the unit we observed the difference in the soil with and without the worms.