Which of the following methods of producing electricity have the lowest net energy ratios?
a. nuclear power and photovoltaics
b. nuclear and wind power
c. wind power and coal
d. coal and hydroelectric
e. nuclear and coal
A
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Two objects move toward each other because of gravity. As the objects get closer and closer, the force between them
A) increases. B) decreases. C) remains constant.
A city is considering the location of its next landfill. According to EPA requirements for new landfills, the city should consider
A) a region near an airport. B) a region prone to earthquakes. C) a low swampy region near a river. D) an elevated region above the water table.
Which of the following components makes up the largest percentage of most soils?
A) Mineral portion B) Pores filled with water C) Organic portion D) Pores filled with air
A warmer world is least likely to result in ____.
A. decreased food production B. ecosystem collapse C. a rise in sea level D. less flooding E. spread of tropical diseases