Newly revised! This is a fantastic science resource! Science is recognized as the key subject of this decade and this new and exciting encyclopedia brings these scientific principles within the grasp of the child. Ten major subject areas are covered--planet earth, living things, human biology, chemistry and the elements, materials and technology, light and energy, forces and movement, electricity and electronics, and conservation and the environment, as well as biographies of important scientists. More than 3,500 indexed references, over 2,000 color illustrations and photographs, drawings, charts and graphs. Children can browse through the book for the pleasure of scientific discovery or use it to research school projects. Hardcover, 488 pgs., 8 1/2" x 10 3/4", Ages 8 and up.