The Water Cycle Water Cycle for Schools Go to a page to view the Kid's Water Cycle diagram Water cycle for kids (ages 5-95) and schools - in many languages. Available as: Diagram | Interactive Web site Earth's water is always in movement, and the natural water cycle, also known as the hydrologic cycle, describes the continuous movement of water on, above, and below the surface of the Earth. Water is always changing states between liquid, vapor, and ice, with these processes happening in the blink of an eye and over millions of years.