Twenty-seven activities dealing with the marine environment of the Great Lakes are presented. Designed for junior and senior high school students, these activities develop awareness of the biological, physical, social, economical, and aesthetic dimensions of the Great Lakes. Field trips, films, discussion, and hands-on activities are used to teach the students about a variety of topics including ports, shipping, wastewater treatment, sunken treasure, geography, recreational and occupational skills, energy, pollution, fish, art, and ecology. The format for the activities varies, but information may include objectives, materials, learning activity, student directions and handouts, contact person for field trips, and background information. (DC)