Contains explanations of more than 2,500 scientific terms, covering materials, mixtures and compounds, energy, forces and motion, Earth and space, light, sound and electricity, plants and fungi, animals, and the human body; and includes listings for 1,000 recommended Web sites.

Previous ed.: 2002. Includes index.

Materials -- Mixtures and compounds -- Energy, forces, and motion -- Earth and space -- Light, sound, and electricity -- Plants and fungi -- Animal world -- Human body -- Science facts and lists.