In this lesson, students learn about different types of seismic waves on the basis of where and how the waves move. In addition, students discuss how scientists use earthquake waves to investigate ...

These are its main layers, starting with the outermost ... inner core and a liquid outer core. There are three types of seismic waves – P waves, S waves and surface waves.

The study of seismic waves provides evidence for the internal structure of the Earth, which cannot be observed directly. P waves are detected on the opposite side of the Earth. Refractions between ...