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z The water cycle involves three major processes: evaporation, condensation, and precipitation. condensation: The process by which a gas changes into a liquid. • evaporation: A process by which a substance changes from its liquid state to its gas state by random particle movement. Evaporation usually occurs at the surface of a liquid over a wide range of temperatures. • precipitation: Any type of liquid or solid water that falls to Earth's surface, such as rain, snow, or hail. • The water that you drink and depend on for survival is fresh water. • Fresh water: Water that has an extremely low salt concentration. Most lakes and rivers are made up of fresh water. • The water in the ocean is salt water. • Salt water: Water that contains dissolved salts and other minerals. Oceans consist of salt water. • Through the water cycle, the ocean water that human beings cannot drink becomes a source of fresh water for human beings and other life on Earth. • Water cycle: The continuous movement of water on Earth, through its atmosphere, and in the living things on Earth.