<P> An aquifer is an underground layer of water - bearing permeable rock , rock fractures or unconsolidated materials ( gravel , sand , or silt ) . Groundwater can be extracted using a water well . The study of water flow in aquifers and the characterization of aquifers is called hydrogeology . Related terms include aquitard , which is a bed of low permeability along an aquifer , and aquiclude ( or aquifuge ) , which is a solid , impermeable area underlying or overlying an aquifer . If the impermeable area overlies the aquifer , pressure could cause it to become a confined aquifer . </P>
<P> An aquifer is an underground layer of water - bearing permeable rock , rock fractures or unconsolidated materials ( gravel , sand , or silt ) . Groundwater can be extracted using a water well . The study of water flow in aquifers and the characterization of aquifers is called hydrogeology . Related terms include aquitard , which is a bed of low permeability along an aquifer , and aquiclude ( or aquifuge ) , which is a solid , impermeable area underlying or overlying an aquifer . If the impermeable area overlies the aquifer , pressure could cause it to become a confined aquifer . </P>
what is the name for water that accumulates underground
what is the name for water that accumulates underground
An aquifer
An aquifer