Which of the following materials would be the best natural filter, removing contaminants from groundwater over a long period of time?
A) Fractured granite
B) Slightly clayey sand
C) Conglomerate
D) Mica schist
Answer: B
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An increasing number of states have adopted a federal form of government primarily to
A) grant different ethnicities or nationalities more effective representation. B) encourage the breakup of the superpower alliances. C) govern compact states more effectively. D) deploy scarce resources efficiently. E) meet all of the above needs.
Worldwide salinty varies between ________ and ________
A) 5‰; 10‰ B) 34‰; 37‰ C) 47‰; 51‰ D) 65‰; 67‰
How will melting permafrost in polar regions lead to a positive feedback loop that will continue to warm the climate, which will allow for more permafrost to melt?
A) Buried CFCs will be released from contaminants in frozen vegetation B) Methane will be released as the vegetation thaws C) Nitrous oxide will be trapped in the meltwater generated and pulled out of the atmosphere D) Carbon dioxide is sequestered in the water infiltrating the landscape
An assemblage of minerals and organic matter bound together is called a
A) mineral. B) molecule. C) rock. D) element. E) granitic compound.