The purpose of this assessment probe is to elicit students’ ideas about pollution. The probe is designed to uncover commonly held ideas about acid rain, which is caused when normal rain combines with things in the air that come from pollution. This probe is best used with students in grades 6–12, who have some knowledge of the basic chemistry involved. A materials list, teacher background information, references, assessment, and outcomes are provided. This book selection includes the Table of Contents, Foreword, Preface, Acknowledgments, About the Authors, Introduction, and Index.