If everyone in the world lived a lifestyle similar to the average U.S. citizen we would need ________ more planets to support everyone.
A. eight
B. two
C. six
D. four
Answer: D
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The United Nations Convention on the Law of the Sea allows coastal states, including island nations, to claim up to 400 nautical miles of the ocean off their shores as an Exclusive Economic Zone
Indicate whether the statement is true or false.
What marks the limit of rapid marine erosion?
A) Sea cliffs B) Wave-cut platforms C) Sea caves D) Blowholes
Which one of the following best illustrates a nonpoint source of pollution?
A) Oil leaking into the ocean from an oil rig B) Wastewater from a coal-fired power plant C) Storm-water drainage from the parking lot around a football stadium D) Raw sewage released into a river when storm-water overflows a city's sewage treatment facility
The number of people over 65 represented as a percentage of the labor force is described as a(n)
A) dependency ratio. B) elderly support ratio. C) K-12 support ratio. D) national retirement ratio. E) demographic transition.