Answer:
Surface waves and Body waves are both seismic waves. Seismic waves are waves of energy that are caused by earthquakes. Body waves travel inside the Earth, or through the Earth, in all directions. Surface waves travel along the surface of the Earth. The two types of body waves are primary (P) and secondary (S) waves. When we measure the time it takes for a wave to come to form an epicenter to a measuring station we can conclude what materials the wave passes through because waves slow down or get absorbed when passing through matter.