To swimmers and surfers, the ocean is an aquatic playground. However, to witnesses of a destructive tsunami wave, the ocean can also be a source of potential danger to lives and property. Waves, tides and currents are what drive the sea. Waves we associate with the beach and having fun.
Tides signal the stages of the moon and the time of day.
Currents provide passage for international boats that bring us food and goods from far away lands. All three contain energy of motion and potential energy. The slightest change in any of these effects us in many more ways than you think. Everyone has seen waves on a lake or oceans. Waves are actually energy.