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.   Sometimes the activity is great just the way it’s written and explained like the screaming balloon. This activity is one of many you can find …