Turn your students' fascination for sea creatures into a better understanding of the earth's water resources---and our role in protecting them. Features detailed descriptions of marine ecosystems, from estuaries to deep-sea trenches. In-text questions and activities promote concept mastery and build critical thinking skills. Includes vivid photography, a glossary, and reading suggestions. (Mentions evolution.) Ages 10 and up. 140 pages, softcover from Walch.