This document on meteorology is one of a four-volume series of Project Earth Science that includes exemplary hands-on science and reading materials for use in the classroom. This book is divided into three sections: activities, readings, and appendix. The activities are constructed around three basic concept divisions. First, students investigate the origin and composition of Earth's atmosphere. Students learn that there is much more to air that meets the eye. Second, students examine some of the factors that contribute to weather. Third, students are introduced to the concepts of air masses and the ways these masses interact to produce the weather. The document also includes a set of readings to enhance teacher preparation or serve as additional resources for students interested in further study. Included as an appendix is an annotated bibliography that serves as a supplemental materials guide. (Author/ZWH)