The process by which water circulates from the Earth to the atmosphere is called the water cycle, or hydrological cycle. This cycle consists of several key stages, including evaporation, condensation, precipitation, and infiltration. Water from oceans, lakes, and rivers evaporates into the atmosphere as water vapor, then cools and condenses to form clouds. Eventually, the moisture is released as precipitation (rain, snow, etc.), returning to the Earth. This water can flow back into bodies of water or infiltrate the ground, replenishing groundwater supplies. The water cycle is essential for maintaining ecosystems and supporting life on Earth.