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  2. Water cycle - Wikipedia

    en.wikipedia.org/wiki/Water_cycle

    The residence time of a reservoir within the hydrologic cycle is the average time a water molecule will spend in that reservoir (see table). It is a measure of the average age of the water in that reservoir. Groundwater can spend over 10,000 years beneath Earth's surface before leaving. [17] Particularly old groundwater is called fossil water ...

  3. Aquifer - Wikipedia

    en.wikipedia.org/wiki/Aquifer

    The Earth's crust can be divided into two regions: the saturated zone or phreatic zone (e.g., aquifers, aquitards, etc.), where all available spaces are filled with water, and the unsaturated zone (also called the vadose zone), where there are still pockets of air that contain some water, but can be filled with more water.

  4. Reservoir - Wikipedia

    en.wikipedia.org/wiki/Reservoir

    Many dammed river reservoirs and most bank-side reservoirs are used to provide the raw water feed to a water treatment plant which delivers drinking water through water mains. The reservoir does not merely hold water until it is needed: it can also be the first part of the water treatment process.

  5. Groundwater - Wikipedia

    en.wikipedia.org/wiki/Groundwater

    Groundwater is fresh water located in the subsurface pore space of soil and rocks.It is also water that is flowing within aquifers below the water table.Sometimes it is useful to make a distinction between groundwater that is closely associated with surface water, and deep groundwater in an aquifer (called "fossil water" if it infiltrated into the ground millennia ago [8]).

  6. Lake - Wikipedia

    en.wikipedia.org/wiki/Lake

    A salt pan is a small shallow natural depression in which water accumulates and evaporates, leaving a salt deposit, or the shallow lake of brackish water that occupies a salt pan. (The term "salt pan" comes from open-pan salt making, a method of extracting salt from brine using large open pans.) [36]

  7. Salt surface structures - Wikipedia

    en.wikipedia.org/wiki/Salt_surface_structures

    Salt surface structures are extensions of salt tectonics that form at the Earth's surface when either diapirs or salt sheets pierce through the overlying strata. They can occur in any location where there are salt deposits, namely in cratonic basins, synrift basins, passive margins and collisional margins .

  8. Fresh water - Wikipedia

    en.wikipedia.org/wiki/Fresh_water

    The water table is the level below which all spaces are filled with water, while the area above this level, where spaces in the rock and soil contain both air and water, is known as the unsaturated zone. The water in this unsaturated zone is referred to as soil moisture. Below the water table, the entire region is known as the saturated zone ...

  9. Water - Wikipedia

    en.wikipedia.org/wiki/Water

    The water cycle (known scientifically as the hydrologic cycle) is the continuous exchange of water within the hydrosphere, between the atmosphere, soil water, surface water, groundwater, and plants. Water moves perpetually through each of these regions in the water cycle consisting of the following transfer processes:

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