The largest proven coal reserve in the world is located in __________.
A. South America
B. North America
C. Asia
D. Europe
E. Australia
Answer: B. North America
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Why are bays and estuaries especially sensitive to pollution?
A) The water is stagnant. B) Fresh water can be polluted more easily. C) Few bacteria are present to aid with biodegradation of pollutants. D) Pollution flows out with river water or is released directly by industry in busy ports.
Pump and treat technique is used for reversing the damage for
A. groundwater. B. lakes. C. estuaries. D. streams.
Perched aquifer or perched water table can form when:
a. the water table of an aquifer rises b. the vadose zone is filled with water c. an aquitard creates localized zone of saturation d. both b and c
The Doppler effect
A) is most useful in visible satellite imagery. B) was discovered in the middle of the twentieth century. C) results in an increase in emitted wave frequency when an object moves toward an observer. D) results in a decrease in emitted wave frequency when an object moves toward an observer. E) helps explain the formation of mirages.