Science is simply fascinating! It helps us learn about the world around us. Did you know there are sounds animals can hear that people can't? Or that right now we are speeding through space? In these pages you'll learn all about sound motion and more.From the pitter patter of raindrops to the roar of an airplane we hear sounds all around us. But how are sounds made and what makes them different? Learn all about sound waves and echoes. Find out how some sounds are loud quiet high and low.