The water (hydrologic cycle) is driven by

The water (hydrologic cycle) is driven by solar energy and gravity.
The water cycle, also known as the hydrologic cycle or the hydrological cycle, is a biogeochemical cycle that describes the continuous movement of water on, above and below the surface of the Earth.
The water cycle is powered by the energy emitted by the sun. This energy heats water in the ocean and seas. Water flows vertically through the soil and rocks under the influence of gravity.