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 ...

Using this realization, the physicists were able to describe and predict mechanical ... interference patterns of electromagnetic surface waves and discovered, to their surprise, that although ...