This product is a great way for students to learn about mechanical waves. NGSS standard MS-PS4-1 (A simple wave has a repeating pattern with a specific wavelength, frequency, and amplitude.) is covered by this collection of foldables, and it also will help lead right into MS-PS4-2 (A sound wave needs a medium through which it is transmitted). Taking information from a textbook or PowerPoint becomes much more streamlined for students and these foldables make sure they have all the important information they need to understand mechanical waves. The four foldables included cover vocabulary, types of mechanical waves, properties of waves and practice finding the speed of waves. I spent 2-45 minute class periods completing these foldables with my students. This set of foldables has worked great with my students, and I hope you find the same success with yours.