The two correct answers regarding the possible consequences of a lower water table are:
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Land subsidence - When water is pumped from the ground, it can lead to the collapsing of soil and land, resulting in subsidence.
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Saltwater intrusion - A lower water table can allow saltwater from nearby seas or oceans to intrude into freshwater aquifers, which can contaminate the water supply.
The other options (larger aquifers, cleaner water, and rising sea levels) are not consequences of a lower water table.