Book excerpt: Millikens new Blue Planet series covers Earth Science for grades 9 to 12 in five concise yet thorough volumes: Earth, Water, Atmosphere, Space, and Energy. Each book includes 12 fullcolor transparencies to enhance classroom demonstrations, plus 60 reproducible pages. Water focuses on the oceanic and water-based portion of geology. It covers aspects of the hydrosphere, including the evolution of water on Earth, the physics and chemical nature of water, water movement through the hydrologic cycle, oceans and ocean currents and waves, tides, surface and groundwater systems, and glaciers.