After several repetitions, ask students to describe their observations ... traveling through the Earth or along its surface. For instance, seismic waves carry energy from the source of the shaking ...

There are three types of seismic waves – P waves, S waves and surface waves. P waves are longitudinal waves, and their relative speed is faster than other waves. P waves can travel through ...

S-waves which oscillate up and down, perpendicular to the direction of travel; and surface waves, which travel along the surface of Mars similar to ripples in a pond. The new research was focused ...