This water cycle diagram depicts an important Biogeochemical Cycle involved in the flow or circulation of water through the ecosystem's various levels. The water cycle is described as a natural process of recycling water in the atmosphere continuously. The hydrological cycle is also defined as the hydrologic cycle. The water cycle diagram is useful for both Class 9 and Class 10. It is one of the few essential topics repeatedly tested in board exams. We've included a well-labeled and simple water cycle diagram for your convenience. Water generally changes states of matter during the water cycle between the earth and the atmosphere: solid, liquid, and gas.