Why is flood hazard mapping considered an important step in floodplain management?
A) Flood hazard mapping guides appropriate development in the floodplain.
B) Flood hazard mapping mandates that the floodplain should not be developed.
C) Flood hazard mapping shows those parts of the urban environment that are impervious.
D) Flood hazard mapping is a first step toward channel restoration.
A
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Nonpoint sources of pollution
a. enter ecosystems from single identifiable sources b. are more difficult to control than point sources c. include smokestacks and automobile exhaust pipes d. are cheaper and easier to identify than point sources e. are always found in rural areas
The mercury thermometer operates on the principle of
A) liquid expansion and contraction. B) energy emission from a surface. C) thermoelectric principles.
Brain drain occurs when
A) highly educated citizens leave a country to move to another country. B) schools are closed by civil unrest. C) universities become unaffordably expensive. D) agricultural experts leave cities for the countryside.
Which of the following controls the rate of groundwater flow?
A. the permeability of the rocks B. the slope of the water table C. how fractured the rocks are D. All of these.