Soil is the loose top layer of the Earth's surface, but what is it made of? How does it form? And why is it so important? In All About Soil, children will learn what components are needed to make the best soils for growing plants while discovering the important role that the forces of erosion play in the creation of this valuable resource. A visit to a grade school showcases a unique program that uses lunch leftovers and hungry earthworms to improve the soil in the school's garden, while an informative demonstration illustrates how sand is created from the continual erosion of rocks. Part of the Earth Science for Children DVD Series. A teacher's guide is available online. 23 minutes. Grades K to 4.