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- Dictionaryground·wa·ter/ˈɡroun(d)ˌwôdər/
noun
- 1. water held underground in the soil or in pores and crevices in rock.
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noun
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Groundwater is the water present beneath Earth's surface in rock and soil pore spaces and in the fractures of rock formations. About 30 percent of all readily available freshwater in the world is groundwater. A unit of rock or an unconsolidated deposit is called an aquifer when it can yield a usable quantity of water. The depth at which soil pore spaces or fractures and voids in rock become comple... Wikipedia