Within this domain, students should understand the causes of waves, tides, and currents. They are also expected to know that water covers most of Earth and be able to describe the topography and composition of the ocean. Finally, students will understand the role of the Sun as the major source of energy and its relationship to wind and water energy.Water Droplet Jupiterimages Corporation, 2006 Image. Discovery Education. Web. 14 August 2017. http://www.discoveryeducation.com