GROUNDWATER basins that provide water for much of the world's food production are in danger of becoming too salty for plants and animals. This risk will remain even if care is taken not to deplete them further.A groundwater basin is a large geological structure in which vast quantities of fresh water are stored in volumes of buried, permeable rocks called aquifers. Often the basin is in an "open" state, which means water is constantly flushed through it. But if the water level falls too low, the basin can become "closed", and water cannot leave the aquifers via rivers or underground flows.
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