"Budding scientists will love learning about the properties of sound by planning and carrying out investigations that explore how the energy form is affected by material density, pitch, and distance."-- Provided by publisher.

A world of sound -- Sounds on the move -- How sound travels -- Let's investigate: bag of sound -- Looking at sound waves -- Changing pitch -- Let's investigate: pitch perfect -- Hearing sounds -- Let's investigate: loud mouth -- Reflecting and absorbing -- Using sound energy -- Investigate more -- Science challenge tips.