Have students watch a video of a slinky in slow-motion, showing them a longitudinal wave in action. After this, explain the “anatomy” of both types of waves. Next, discuss and examine sound waves with your class, along with amplitude and frequency. Use the diagrams to help students visualize this. Explain and show students the crest, trough, resting point, fixed point, amplitude, and wavelength of a wave. Demonstrate how different sound waves have distinct shapes. Give students a chance to match the sound wave with its correct description in another activity.