Which of the following factors may cause a population to grow?
A. higher birthrate than death rate
B. low immigration
C. lower birthrate than death rate
D. higher ratio of post-reproductive females
Answer: A
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In terms of the three-cell model of the general circulation, which of the following latitudes is the likely location of surface low-pressure areas?
A. equator and the poles B. equator and 30° latitude C. equator and 60° latitude D. 30° latitude and 60° latitude
In the United States, the pressure to convert new land into crop production has
A) decreased, and the use of erosion-prone land has been reduced. B) decreased, but the use of erosion-prone land has increased. C) increased, but the use of erosion-prone land has been reduced. D) increased, and the use of erosion-prone land has been increased.
Which of the following best matches the description?Decision-making process that uses input such as risk assessment and economic impacts.
A. probability B. risk management C. supply/demand curve D. risk E. sustainable development F. external costs G. subsidy H. negligible risk I. risk assessment J. demand
Four companies, Alpha, Beta, Gamma and Delta, are burning coal to produce electricity. As a result, they also produce emissions. In the table below, the first row of shows the total pounds of emissions currently produced by each firm. The other rows of the table show the cost for each firm of reducing emissions by the first 50 tons, the second 50 tons, and so on. The total cost of requiring each firm to reduce its garbage by one third is
A. $167 B. $137 C. $187 D. $127