What are underground layers of water-bearing rock, renewable unless contaminated?

• A. Aquifers
• B. Water Table
• C. Groundwater Withdrawals
• D. Desalination

Answer: (A)

Groundwater storage in underground layers called aquifers. An aquifer is a body of permeable rock or sediment that can store and transmit groundwater, allowing water to move through the subsurface. They are replenished naturally by rainfall and other precipitation that infiltrates down to the water-bearing zone, so they are renewable over time as long as recharge keeps pace with withdrawals. However, if water is drawn out faster than it can be recharged or if pollutants enter the formation, the aquifer can become depleted or contaminated, reducing its usefulness for drinking or irrigation. The other terms describe different things: the water table is the upper boundary of the saturated groundwater zone, groundwater withdrawals are the act of removing water, and desalination is the process of removing salt from seawater.