Milliken’s Blue Planet series covers earth science for grades 9 to 12 in five concise yet thorough volumes: Earth, Water, Air, Space, and Energy. Each book includes 12 full-color transparencies to enhance classroom demonstrations, plus reproducible pages. Earth focuses on the Earth-centered portion of the study of geology. Concepts covered include: 1. Earth composition 2. Rocks and minerals 3. Plate tectonics 4. Tectonic effects 5. Gravity 6. Earth changes over time – geologic ages 7. Geochemical cycles