CK-12 Foundation
Ck 12: Physical Science: Hearing and the Ear
[Free Registration/Login may be required to access all resource tools.] Explains how we hear sound, how the ear works, and the different structures of the ear.
E-learning for Kids
E Learning for Kids: Science: Seychelles: How Do We Hear?
This lesson teaches students about how sound vibrations are transmitted through solids, liquids, and gases, and about how materials may absorb sound.
NASA
Nasa: The Space Place: Have Super Hearing With a Super Sound Cone
This site from NASA provides an interesting approach to the subject. How do messages travel in space and how do we intercept those messages on Earth? Find out the answers as well as find out how NASA's giant dish antennas work.