Here's a project for studying compression waves in different soil types. It uses a homemade wave tank for solids, with a frequency generator, amplifier, and loudspeaker as the vibration source. There are lots of interesting possibilities...

Students explore the characteristics of both transverse and longitudinal waves.

This resource explores how vibrating objects produce sound waves. The site contains information and an animation.

This site offers a variety of everyday activities and everyday experiences in which waves or sound waves play a role.