Answer the following question given this paragraph: 

An underground layer of rock that is saturated with groundwater is called an aquifer . A diagram of an aquifer is shown in Figure below . Aquifers are generally found in porous rock, such as sandstone. Water infiltrates the aquifer from the surface. The water that enters the aquifer is called recharge.


Q: What is the term for an underground layer of rock that is saturated with groundwater?


A:
aquifer