Discussion
The capillary fringe is the part of the zone of aeration in which water is
Answer: C
Correct answer: drawn up above the water table by surface tension
Water is drawn above the water table into the fine pores by capillary action, so the fringe is fully or nearly saturated yet stands at a pressure below atmospheric. Its height depends on the pore size - a few centimetres in gravel, several metres in clay - and because that water is held in tension it will not flow into a well, so the fringe cannot be pumped.
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