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An aquifer is a geological formation of permeable rock, sand, or gravel that stores and transmits groundwater. It is a critical source of fresh water for wells, irrigation systems, and municipal water supplies. Aquifers can be classified into two types: confined and unconfined. Confined aquifers are trapped between impermeable layers of rock or clay, while unconfined aquifers have a permeable layer above, allowing water to flow freely into and out of the formation. The recharge rate of an aquifer depends on factors like rainfall, soil permeability, and the presence of vegetation. Over-extraction of water from aquifers can lead to depletion, reduced water quality, and environmental issues like land subsidence. Proper management and sustainable extraction are essential to preserve aquifers as a vital water resource.

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