The future use of photovoltaics is likely to
A) increase, because they can be adapted to meet a variety of needs
B) increase, because the energy is less expensive than that generated by fossil fuels
C) decrease, because they have proven to be inefficient
D) decrease, because they require large, centralized generating facilities
A
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Which of the following processes are cyclic global changes?
a. The supercontinent cycle b. The sea-level cycle c. The rock cycle d. All of the above e. Both a and c
Why are low latitudes the most dangerous latitudes to have a large volcanic eruption occur?
A. Explosions there are able to change Earth's tilt by a few degrees. B. The lack of snow and ice allows lava to do more damage before it cools. C. Ash and gases from low-latitude eruptions are spread around Earth to the greatest degree. D. Seismic waves generated by explosions there are able to travel to both hemispheres. E. The warmer temperatures there make the released gases more dangerous.
A drought defined based on resource shortages is a(n)
A) meteorological drought. B) agricultural drought. C) hydrological drought. D) socioeconomic drought. E) climatic drought.
Which of the following statements best describes how this object may have formed?
A. a supernova explosion, probably from the late-stage evolution of a high-mass star B. a high-temperature star, formed by nuclear fusion C. material accumulated into a sphere because of gravity, and underwent nuclear fusion of hydrogen D. accumulation of mass from an interstellar cloud with pockets of high-mass material becoming stars