
Learn how sound waves are formed and how they change as they move.A True Book: Physical Science allows readers to find answers to puzzling questions as well as discover how people have used physical science to make countless innovations throughout history. This series...

Learn how sound waves are formed and how they change as they move.A True Book: Physical Science allows readers to find answers to puzzling questions as well as discover how people have used physical science to make countless innovations throughout history. This series...