SCIENCE- PURPOSEFUL DESIGN  Students will learn the basic principles of ecosystems, plants, matter, electricity, magnets, earth's surface, the solar system, the nervous & musculoskeletal systems. Full-color, write-in pages show large photographs and highlighted key terms that showcase concepts and systems; students make their own booklets by answering questions and completing exercises that are integrated into the explanatory text. A review and a journal entry completes each chapter.