They are a terrific example of how living things adapt to their environment. As earthworms tunnel in the soil, add fertilizer, and stir the various layers of decaying matter, they actually become part of a natural recycling process. This book is packed with facts and experiments that explore how earthworms live and contribute to our rich Earth. Rocks and Soil. Children's Press, 1982.
Earthworms make our soil more fertile as they pull dead leaves underground.
Through color photographs and illustrations, you'll see how rocks and soil are made and how we use them. Other topics, such as erosion, fossils, and soil types are included, along with activities, experiments, a glossary, and an index. Under Your Feet. Illustrated by Dennis Nolan. Perhaps an earthworm is burrowing below the ground where you are running barefoot.