The effects of land subsidence due to groundwater extraction are generally ____

a. ?problems for a period of months, until more groundwater seeps in to deep clays
b. ?permanent and irreversible
c. ?in effect for several years, until major storms irrigate the area
d. ?reversible by returning water to the aquifer
e. ?unpredictable and impossible to plan for effectively


ANSWER: b

Environmental & Atmospheric Sciences

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