A simulated environmental problem is the focus of applying the steps of the scientific process. The problem is the mysterious appearance of a coating of white powder around the school yard. Students are challenged to identify the powder and its origin. As they meet this challenge, they learn that systematic gathering, organizing, and analyzing of information are a way of coming to understand events in the natural world. Each Teacher Guide includes: Specific teaching and management strategies Detailed teaching sequences for teaching the first three phases of the Learning Experience (Getting Started; Exploring and Discovering; and Processing For Meaning) Reproducible masters for Student Science Notebook pages, Group Recording Sheets, and Home-School Worksheets Extension activities in science, language arts and social studies Assessment materials (an introductory questionnaire, embedded assessments, and a final questionnaire consisting of performance and written components) Science Background (provides general science concepts as they are introduced and developed in the module) to help prepare teacher Teacher and Student Resources section (annotated lists of children's books, teacher reference books, and technological aids)