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The water cycle, also known as the hydrologic cycle or the H2O cycle, describes the continuous movement of water on, above and below the surface of the Earth.
Understanding how the water cycle operates is key to understanding how rivers work. The water cycle is also known as the hydrological cycle [hydrological cycle: The continual movement of water between the rivers, oceans, atmosphere and land.] .It is called a cycle because water continuously moves around the system.Rivers are part of this cycle.he water cycle is also known as the hydrological cycle [hydrological cycle: The continual movement of water between the rivers, oceans, atmosphere and land.] .