Which aquifer would be most effective in purifying polluted groundwater: coarse gravel, sand, or cavernous limestone? Explain

What will be an ideal response?


The slower that groundwater moves through an aquifer, the cleaner it will become. In order to move slowly through an aquifer, there must be porosity and permeability, but it must be constricting enough with fine enough pores that the water transmits at a slow pace. Cavernous limestone is porous and permeable, but the pores are of tremendous size. Gravel is significantly better for this problem than the cavernous limestone; however, water will still move through the pores too quickly to be cleansed. Thus, of the options, sand is the only material that has fine enough pores to have a chance at cleaning the groundwater.

Environmental & Atmospheric Sciences

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a. mP b. mT c. cT d. cP e. cA

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What is the "greenhouse effect" as applied to Earth's atmosphere? How is Earth similar and different than a greenhouse?

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All of the following complicate locational decisions of firms EXCEPT

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Environmental & Atmospheric Sciences