Photovoltaic systems are characterized by all of the following except
A. they convert sunlight into electricity.
B. they have become more efficient over the past 25 years.
C. they are difficult to use where conventional electricity is unavailable.
D. they are economically competitive with fossil fuels in many places.
Answer: C
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You notice preserved ripple marks in the mountains, then later at the beach you see ripple marks forming in the sand. Which of the following best describes how the ripple marks in the mountain formed?
A) deformation B) stratigraphic correlation C) uniformitarianism D) catastrophism
The basic premise behind the "The tragedy of the commons" is
A. when assessing risk, people frequently overestimate unfamiliar risks. B. pollution prevention is costs less than pollution clean-up. C. a resource becomes overexploited when its ownership is shared. D. All of these are correct.
Outline the path of a carbon atom as it moves through the carbon cycle. Do not include human influences.
What will be an ideal response?
When was the modern start of master-planned communities in the United States?
A. 1920s B. 1990s C. 1960s D. 1950s