Environmental Engineering Reference
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D. They are excessively basic on the pH scale.
E. They are hard to work.
61. Which of the following are the most effective methods for long-term disposal of hazardous waste?
A. Hazardous waste landfills
B. Injection wells
C. Surface impoundments
D. General landfills
E. Incineration
62. A savannah is characterized by:
A. Minimal rainfall throughout the year
B. Large amounts of grasses and tall trees
C. Distinct rainy seasons, creating dramatic variations in annual rainfall
D. Consistent rainfall throughout the year
E. Dry soils
63. Which of the following is a result of overgrazing?
A. A positive feedback loop where the soil becomes eroded but quickly recovers
B. A negative feedback loop where the soil becomes eroded and continues to deteriorate
C. A negative feedback loop where the soil becomes eroded but quickly recovers
D. A positive feedback loop that turns into a negative feedback loop
E. A positive feedback loop where the soil becomes eroded and continues to deteriorate
64. Why is the amount of deforestation higher in tropical rain forests compared to other forest types?
A. The forests have more secondary growth trees.
B. Often, governments in the primarily developing countries that hold tropical rain forests sell the
rights to their natural resources as a way of bringing additional money to the country.
C. The trees are mainly hardwood trees.
D. The forests are made up mainly of fast-growing trees.
E. It is more economical to harvest from tropical rain forests than from other types of forest.
65. How can water vapor become a problem in the Earth's atmosphere?
A. Increasing water vapor in the atmosphere creates a positive feedback loop, intensifying the green-
house affect.
B. Excess water vapor creates more intense storms.
C. Decreasing water vapor in the atmosphere creates a positive feedback loop, intensifying the green-
house effect.
D. Increased water vapor can lead to an increase in other greenhouse gases.
E. Less water vapor increases cloud production.
66. Which element powers nuclear power plants?
A. Radon
B. Thorium
C. Plutonium
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