Water (chemical formula H2O) is an inorganic, transparent, tasteless, odorless, and nearly colorless chemical substance, which is the main constituent of Earth's hydrosphere and the fluids of all known living organisms (in which it acts as a solvent ).- Water
The hydrosphere is the combined mass of water found on, under, and above the surface of a planet, minor planet, or natural satellite.- Hydrosphere
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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 describes the processes that drive the movement of water throughout the hydrosphere.