What is the main problem with wind power with regard to reliability?
A. The wind does not always blow.
B. The turbines often break.
C. The blades can snap off in high winds.
D. If it rains, the blades can't turn.
Answer: A
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What kind of solar system can produce electricity?
A. thermal B. passive heating C. active heating D. solar oven
Which of these has the greatest charge?
A. Electron. B. Proton. C. both the same D. none of the above
Which of the following environments is NOT very susceptible to mass wasting?
A. A steep and rocky slope B. A moderate slope made of fill materials C. A gentle slope with deep soils D. A slope that has many buildings on it E. Relatively flat-lying area
Energy resources that exist in limited amounts and cannot be replaced quickly are called __________________.
a. ecological footprint b. vital capacity c. carrying capacity d. nonrenewable resources e. limiting factor