A slinky offers a great way to illustrate how seismic waves travel through Earth’s interior. Place the Slinky on the floor. With two people firmly holding the ends of the Slinky, stretch it out to about 5 ft in length (do not overstretch). On one end, pull the Slinky backward and then push forward rapidly. Stop, and observe. How do the coils move? Which type of seismic wave does this motion mimic? Once the Slinky has stopped moving, jerk the toy to the side so that it moves like a slithering snake. How do the coils move? Which type of seismic wave does this motion mimic?