Grades: 6-12; Subject Areas: Science. (2001) Investigates sound, how it is produced, how it travels, its specific properties, and its everyday uses. Illustrates sound waves and defines the properties of sound, including frequency, pitch, intensity, loudness, and the Doppler Effect. Explores the various interactions between sound waves, such as the reflection of sound and combining of sounds. Includes a ten-question video quiz. For the teacher's guide go to: https://drive.google.com/folderview?id=0B9ZT7PYcIjLfQnBhVHMwYXdiNlU&usp=sharing