This content resource provides information about soil and soil ecosystems in an engaging way. There are three components to the site: Down and Dirty, Field Guide, and Soil Safari. Down and Dirty provides an overview of soil ecology and introduces students to the basic definition of soil and its structure. Students learn about the soil profile as the organizing concept of soil structure; they learn how soil forms by following a step-by-step "recipe" for making soil from solid rock; and they learn how soil is categorized. Field Guide profiles species selected from each major type of soil organism, ranging from the largest animals to live underground to the smallest micro-organisms. Each profile provides information on the organism's size and ecological role in creating and maintaining soil health. Soil Safari is an interactive game that shows students the importance of the organisms and physical structures in soil at different size scales. They can start at a size of 300 mm and go down to 0.003 mm (3 microns). The same organisms profiled in the Field Guide appear here as characters in a goal-based learning game. Students are drawn through the exploration by a mission to find something living in the soil that can take care of a leaking toxic chemical. (author/ts)