These cycles include both the living biosphere and the nonliving lithosphere, atmosphere, and hydrosphere. It exists at the interface of the lithosphere, atmosphere, hydrosphere and biosphere. It exists at the interface of the lithosphere, atmosphere, hydrosphere, and biosphere. The pedosphere interfaces with the lithosphere, the hydrosphere, the atmosphere, and the biosphere. Even lighter still are the watery liquid hydrosphere and the gaseous, nitrogen-rich atmosphere. TBBPA emits can be found in trace concentration in the hydrosphere, soil, and sediments. Earth is the only terrestrial planet known to have an active hydrosphere. Only one terrestrial planet, Earth, is known to have an active hydrosphere. Its mass is approximately equal in magnitude to Earth's hydrosphere. The hydrosphere and atmosphere would be retained on its inside. An ocean is a body of water that composes much of a planet's hydrosphere. An ocean is a major body of saline water, and a component of the hydrosphere. An ocean () is a body of water that composes much of a planet's hydrosphere. The water cycle describes the processes that drive the movement of water throughout the hydrosphere. Marq de Villiers has described the hydrosphere as a closed system in which water exists.