What was that sound? Introduce early readers preK-2 to sound and how it plays a part in their everyday lives. Find out how sound is made, how it travels, and how we can hear it. Readers explore the basic concepts of sound through carefully leveled, engaging text and bold photographs reviewed by Smithsonian experts. Additional facts and graphic organizers such as charts and graphs provide more information about physics concepts. Provided by publisher.

What is sound? -- Sound waves -- How sound waves move -- Making sounds -- Hearing sounds -- Cochlear implants -- Loud or soft? -- Pitch and frequency -- The Doppler effect -- Echoes -- Measuring sound -- Using sound. Making music -- Sound tools.