Here’s a great collection of activities, with explanations and elaborations, that I hope will enrich your resources for teaching sound. I presented this information at a workshop at the OSTA state conference.   One example in the Evidence Statement for NGSS 1-PS4-1 suggests using a tuning fork to show vibration. That’s a fun demonstration and you might add to the demo by showing a slow motion video of a vibrating tuning fork that touches water. Another video you might choose was created by the SloMo Guys. I like their videos but suggest you turn off the sound and discuss what’s seen because …