CHAPTER 1 A DAY AT THE BEACH David is at the beach with his family He runs to the shore A small wave rolls onto his feet Then he looks out at the ocean He sees surfers riding large waves What causes these waves to happen Ocean waves are often caused by wind Un
Waves are regular patterns of motion They are caused when an energy source creates a disturbance This disturbance then travels It carries energy from one place to another For waves on a lake the energy source is usually the wind The ripples on the surface are the disturbance The disturbance carries the energy of the wave But waves are not only in water They are everywhere in nature
