Hydrogeology (hydro- meaning water, and -geology meaning the study of the Earth) is the part of
hydrology that deals with the distribution and movement of
groundwater in the
soil and
rocks of the Earth's
crust, (commonly in
aquifers). The term geohydrology is often used interchangeably. Some make the minor distinction between a hydrologist or engineer applying themselves to
geology (geohydrology), and a geologist applying themselves to hydrology (hydrogeology).
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The geology of ground water, with particular emphasis on the chemistry and movement of water.