They watched as Mrs. Harbour and Ms. Peters explained how sound vibrates and travels in sound waves through a demonstration with a cup of water and a tuning fork. We could actually see the vibrations in the water! We also did a class activity that showed up how a sound wave actually moves.
Sound Waves
In a video we watched, we learned how different animals use sound waves as in echolocation. As an extension activity we brought in empty water bottles, filled them up with different amounts of water, and learned how to blow into the bottle and make sound by making the water vibrate.
The sound it made depended on how much water was in each bottle. Below are some really cool websites. We weren't able to go to all of them in class due to time but the kids would really enjoy them at home.
Find Sounds
BBC schools
Magic School Bus
Crickweb