D. all of the above are impacts
Overuse of groundwater can lead to a lowered water table, which can in turn cause the ground to sink as the soil compacts without the support of water. Additionally, excessive withdrawal of groundwater can allow salt water from the ocean to intrude into freshwater aquifers, contaminating the supply with salt.
The human race is using the freshwater from our groundwater aquifers faster than it can be replaced. This overuse can result in the following:
A. the water table being lowered
B. the ground sinking
C. salt water mixing into our freshwater supply
D. all of the above are impacts
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