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However, much more water is "in storage" (or in "pools") for long periods of time than is actually moving through the cycle. The storehouses for the vast majority of all water on Earth are the oceans. It is estimated that of the 1,386,000,000 km 3 of the world's water supply, about 1,338,000,000 km 3 is stored in
Rain falling over a drainage basin in Scotland.Understanding the cycling of water into, through, and out of catchments is a key element of hydrology. Hydrology (from Ancient Greek ὕδωρ (húdōr) 'water' and -λογία () 'study of') is the scientific study of the movement, distribution, and management of water on Earth and other planets, including the water cycle, water resources, and ...
A biogeochemical cycle, or more generally a cycle of matter, [1] is the movement and transformation of chemical elements and compounds between living organisms, the atmosphere, and the Earth's crust.
A hydrologic model is a simplification of a real-world system (e.g., surface water, soil water, wetland, groundwater, estuary) that aids in understanding, predicting, and managing water resources.
[3] [4] In the ocean, hydrothermal vents erupt magma and altered seawater fluids including abundant H 2, depending on the temperature regime and host rock composition. [ 5 ] [ 4 ] Molecular hydrogen can also be produced through photooxidation (via solar UV radiation ) of some mineral species such as siderite in anoxic aqueous environments.