Because though water does come back in general via the water cycle it doesn’t come back evenly everywhere there are some places which get less rain than they use in water, in this case they use underground water sources called aquifers. Aquifers are underground stores of water in permeable rock. These stores of water can be used for farming or drinking, but can become depleted or result in salt contamination, causing serious issues for populations that are relying upon the aquifers. – https://youtu.be/xbUfVLxYVcE
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