The two correct answers regarding the possible consequences of a lower water table are:
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Land subsidence - As water is pumped out from underground aquifers, the soil that was previously supported by the water can collapse, leading to land subsidence.
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Saltwater intrusion - A lower water table can allow saltwater to intrude into freshwater aquifers, especially in coastal areas, as the pressure balance shifts.
So the correct responses are "land subsidence" and "saltwater intrusion."