This book is number 3 of a series of elementary science books that presents a wealth of ideas for science activities for the elementary school teacher. Each activity includes a standard set of information designed to help teachers determine the activity's appropriateness for their students, plan its implementation, and help children focus on a range of exciting and relevant learning experiences. Information accompanying each activity includes developmental level, group size, key experiences, and notes to teachers. Case studies in implementing science activities with groups of students follow specific activities. This volume is divided into 11 parts: (1) "Using Gravity"; (2) "Energy from the Air: Wind Energy"; (3) "Human Energy"; (4) "Sound Energy"; (5) "Heat Energy"; (6)"Weather"; (7) "Change in the Garden"; (8) "Diversity in Change"; (9) "Electrical Energy"; (10) "Energy from Magnets and Magnetism"; and (11) "Energy and Change Case Studies: Some Classroom Experiences." Appendices contain teaching aids including communication techniques for the classroom, materials and equipment, measurement in science, testing and analysis, and safety and science and the development of problem solving skills. (JRH)