Aquifers are a. located below the water table b. important sources of freshwater c. located in the saturated zone d. all of the above

d. all of the above, they are all true

The correct answer is d. all of the above.

An aquifer is an underground layer of sedimentary rock such as sandstone which bears water. Underground layer of water-bearing rock.  Water from rainfall and melting of snow percolates in the ground to fill aquifers. Thus, they are the storehouse of the underground water and is an important source freshwater. The top water level of aquifers are water table.  Water from aquifers used for drinking, agriculture and various industrial purposes.

the "dirty dozen" chemicals banned in an international treaty are formally known as persistent organic pollutants, or pops. the united nations environment program provided this background on what they are and what they can do to humans and wildlife.

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