Grade 3-6–Different Kinds describes how soil is different from dirt; layers, chemistry, and textures and types; and how the material is affected by climate, animals, and people. Micro Life discusses the various beings, from amoeba to larger living things such as slugs and fungi, that depend on soil, clearly explaining such concepts as symbiosis and the food cycle. Soil Erosion offers information on the many ways in which the process can occur, its dangers, and what can be done by children to stop it. The book also discusses positive effects of erosion. How Is Soil Made? is less useful than the other books because much of its content is covered in them, but overall this series enlivens a dry topic and provides solid basics on relevant subjects, complemented by quick and easy experiments and clear, well-captioned color photographs.
