The two correct answers regarding the possible consequences of a lower water table are:
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Saltwater intrusion - Lowering the water table can allow saltwater from nearby bodies of water to move into freshwater aquifers, which can contaminate the water supply.
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Land subsidence - When water is extracted from the ground, especially from aquifers, the land above can settle or sink, leading to land subsidence.
So the correct responses are saltwater intrusion and land subsidence.