Grundwater is the watter locatit beneath the yird's surface in sile pore spaces an in the fracturs o rock furmations. A unit o rock or an unconsolidatit deposit is cried an aquifer whan it can yield a uisable quantity o watter. The deepth at which sile pore spaces or fracturs an voids in rock acome completely saturatit wi watter is cried the watter table. Grundwatter is rechairged frae, an eventually flaes tae, the surface naiturally; naitural dischairge eften occurs at springs an seeps, an can furm oases or wetlands. Grundwatter is an aa eften widrawn for agricultural, municipal an industrial uise bi constructin an operatin extraction wells. The study o the distribution an movement o grundwatter is hydrogeology, an aa cried grundwatter hydrology.
Teepically, grundwatter is thocht o as liquid watter flawin through shallae aquifers, but technically it can an aa include sile moistur, permafrost (frozen sile), immobile watter in verra law permeability bedrock, an deep geothermal or ile furmation watter. Grundwatter is hypothesized tae provide lubrication that can possibly influence the movement o fauts. It is likely that muckle o the Yird's subsurface conteens some watter, which mey be mixed wi ither fluids in some instances. Grundwatter mey nae be confined anly tae the Yird. The formation o some o the landforms observed on Maurs mey hae been influenced bi grundwatter. Thare is an aa evidence that liquid watter mey an aa exist in the subsurface o Jupiter's muin Europa.
- Richard Greenburg (2005). The Ocean Moon: Search for an Alien Biosphere. Springer Praxis Books.