waves. Energy transferred by the vibration of molecules creates a wave. Waves have a particular shape with peaks and valleys. The size of a wave depends on how much energy it has. The molecules in a wave stay in one place and just move slightly back and forth or up and down. Transverse waves and longitudinal waves are explained. Atoms, molecules, and energy are defined.

24 full-color, illustrated pages. Reading Level 1-3, Interest Level 2-5. Includes a pronunciation guide for scientific terms.