This instructional packet introduces students to soil biology, ecology, and specific farming practices that promote sustainable agriculture. It helps students to discover the role of earthworms in improving the environment of all other soil-inhabiting organisms and in making the soil more fertile. The activities (classroom as well as outdoor) feature hands-on exercises for participants to gain experience in the association of land management with good soil health. Self-contained background information, activities, visual masters, and some color transparencies are included. The individual instructional exercises can be used independently with units in horticulture, natural resources, ecology, management, soils, livestock systems, and cropping systems. Unit topics include: understanding basic soil biology principles; recognizing the relationship between plants, animals, and the soil; discovering the impact of tillage and nutrient management; discovering the role of earthworms in maintaining good soil health; and exploring earthworm management. Contains 16 references. (JRH)