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Sagot :
The right option is B. water-table aquifers
Water-table aquifers are underground layer of water whose water table is at atmospheric pressure and is not below a confining layer. Water-table aquifers are susceptible to drought conditions and pollutants because they are usually closer to the earth's surface. Water-table aquifers can be polluted by naturally occurring mineral and metallic deposits in rock and soil, manufactured chemicals such as fertilizers, and dumps or landfills. When ground water pollutants reach a water-table aquifer, they make the water unclean and unusable for decades.
Water-table aquifers
Further Explanation:
Water-table aquifers are more susceptible to pollution. The water table is the specific part of groundwater, whereas aquifers are the entire portion of groundwater of an area. Aquifers are a large storehouse of water-bearing rocks, gravel, sand, and silt. The water content of the aquifers keeps on changing with seasons. Three different types of water aquifers are present, which are confined, unconfined, and semi-confined.
The groundwater resources are more prone to pollution due to agricultural waste, landfills, hazardous chemicals, and atmospheric pollutants. Human activities are responsible for groundwater pollution. The chemicals and toxic waste can be accidentally or intentionally released in the groundwater. The porosity and permeability of soil allow the contaminants to reach with an ease to aquifers. The pollutants can move to the underground through the root system and animal burrows also. If any river or stream is present nearby the contaminated groundwater, then the risk of river contamination is very high. Some naturally occurring substances like decaying organic matter moves towards the groundwater and change the taste, color, and odor of the water.
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Answer details:
Grade: High school
Subject: Biology
Chapter: Water pollution
Keywords:
Groundwater, pollutants, toxic, human activities, root system, aquifers, confined, semi-confined, unconfined, contamination.
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