Ecological tipping points related to the earth's major natural systems are also called ____.
A. natural limits
B. extinction forces
C. ecological delimiters
D. planetary boundaries
E. biosphere requirements
Answer: D
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The standard metric unit of volume, the liter, is equal to which of the following?
A) 1 cm3 B) 10 cm3 C) 100 cm3 D) 1000 cm3
Which zone changes most with latitude?
A. littoral B. bathyal C. mesopelagic D. hadal E. abyssal
What is the phase change in which water changes from a solid directly to a gas?
A. sublimation B. melting C. evaporation D. freezing E. condensation
Which of the following statements is true concerning radioactive wastes?
A. Spent fuel rods have had their radioactivity depleted. B. Low level wastes are stored at nuclear power plants since they are not as dangerous as nuclear wastes. C. Military wastes have a lifetime of approximately 100 years. D. Consumer wastes tend to accumulate at the fastest rate.