This book is one in a series of Earth science books and contains a collection of 18 hands-on activities/demonstrations developed for the middle/junior high school level. The activities are organized around three key concepts. First, students investigate the unique properties of water and how these properties shape the ocean and the global environment. Second, students perform activities investigating the complex systems that lead to the development of currents, waves, and tides. This section focuses on the interactions of wind, water, gravity, and inertia. In the third section, students study the impact that humans have on the ocean and the marine environment, particularly effects of pollutants. The five readings included are intended to enhance teacher preparation or serve as additional resources for students interested in further study by elaborating on concepts presented in the activities. Other readings introduce supplemental material so that teachers can connect science to broader social issues. An annotated bibliography is included as Appendix B and is intended to serve as a supplemental materials guide. Entries are divided into various categories: activities and curriculum projects, books and booklets, audiovisual materials, instructional aids, information and references, Sea Grant programs, and Internet resources. (JRH)