Recharge of groundwater
A. is slow, so that nearly all ground water has been underground millions of years.
B. varies according to the geology and climate of the region and so groundwater may have been underground a few years (Karst regions) to 10,000 years or more (southwestern USA).
C. is fast, so that ground water supplies are generally plentiful and consist of water that has been underground for only a few years.
D. is unpredictable.
Answer: B
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