Sound Waves

Squeak! Grrr! CRACK! Shhh! Our world is filled with sounds big and small, pleasant and annoying. But how is all that sound created and what can it do? In this book, readers in grades 4-9 will learn how sound travels and the many roles it plays in our world. Sound helps us communicate, but it can do so much more. You might be amazed at how powerful sound waves can be when they let us see into the h...