In watery regions, forests regulate the water cycle (hydrological cycle). The water cycle, also known as the hydrological cycle or the H₂O cycle, describes the continuous movement of water on, above, and below the surface of the Earth. The water cycle involves the exchange of energy, which leads to temperature changes. For instance, when water evaporates, it takes up energy from its surroundings and cools the environment. When it condenses, it releases energy and warms the environment. The heat exchange regulates the climate. Forests help control the water cycle by regulating precipitation, evaporation, and flows.