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.
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The Don River lies in the European part of the Northern Eurasian region, and therefore:
A) is largely untouched by human development B) suffers from diverse and numerous sources of pollution C) empties into the Pacific Ocean D) is free from cold winter conditions
All of the following complicate locational decisions of firms EXCEPT
A) firms have only one site or situation factor. B) more than one critical location may emerge. C) because there are unknowns, firms cannot always precisely calculate the costs at various locations. D) firms may select its location based on inertia. E) amenities at a given location.
Which of the following air masses would have its origin over the Gulf of Mexico and the Caribbean Sea?
a. mP b. mT c. cT d. cP e. cA
What is the "greenhouse effect" as applied to Earth's atmosphere? How is Earth similar and different than a greenhouse?
What will be an ideal response?