This water cycle diagram is also known as the hydrological cycle or the hydrologic cycle. Water changes states of matter during the water cycle between the earth and the atmosphere: solid, liquid, and gas. The water cycle diagram is beneficial to both Class 9 and Class 10. The water cycle, also known as the hydrological cycle, is the continuous movement of water from the earth to the atmosphere as water vapor and back to the earth as rain. The water cycle comprises the sun and water bodies such as oceans, seas, rivers, and lakes.