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2001. GEMS. As its title suggests, this guide is designed to help students understand the tremendous environmental importance of the ocean. The unit begins with a revealing hands-on activity, "Apples and Oceans," that focuses on the vast proportion of the Earth that is ocean and the much smaller slices where ocean resources are concentrated. Students launch an intensive investigation of species-threatening issues related to key ocean fisheries and the increasing scarcity of ocean resources. 190 pages, soft cover, b&w illustrations. Grades 5-8.