This title will explain what sound is and how it travels in waves. It will also explain what pitch and loudness is, and how humans hear it. It is complete with carefully chosen photographs and labeled diagrams to help visual learners. Aligned to Common Core Standards and correlated to state standards. Abdo Kids Jumbo is an imprint of Abdo Kids, a division of ABDO. Translated by native Spanish speakers--and immersion school educators.<\\P>