The water cycle involves the movement of water above, on, and below Earth's surface. The most important processes involved in this cycle are storage, evaporation, precipitation and runoff. Water is temporarily stored in the ground: in oceans, lakes, and rivers; and in the polar ice caps. Groundwater, which is found the to Earth's is most accessible and supplies much of people's needs. Most of the world's water is Salt water that comes from oceans. Water that evaporates from the ocean, however, mostly salt-free. As a result, rain and snow provide good sources of freshwater