The country of Libya is located above the Nubian Sandstone aquifer, which gives it access to an amount of water about equal to all of the Great Lakes. Despite this, much of the water cannot be used. Why not?

A. Excess pumping of groundwater from neighboring Egypt has caused saltwater intrusion into the aquifer.
B. A number of mining operations in the country have contaminated the aquifer with carcinogenic (cancer causing) chemicals.
C. Two large cones of depression, resulting from source wells, make the water inaccessible.
D. The aquifer is contaminated with high concentrations of arsenic.


Answer: C

Environmental & Atmospheric Sciences

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