Which statement is false?
A. CFCs are persistent chemicals.
B. Ozone depletion is worst in Antarctica.
C. CFCs substitutes have been found.
D. Ozone thinning levels remain steady over seasons.
E. CFCs contribute to global warming.
Answer: D
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All of the following are possible effects of climate change in South Asia, except:
A) sea level rise and land loss in Bangladesh B) drought in northern Indian C) receding glaciers in Himalayas D) escalation in malaria E) all of the above
Which of the following is true about the base level of a stream?
A. The flat top of a mountain is the ultimate base level for most streams. B. Base level generally is near the steepest part of a stream's profile. C. Most streams have lower gradient close to their base level. D. A mountain is close to its base level if bedrock is close to the surface. E. Base level indicates the normal (or base) flow level before flooding.
How is stream power calculated?
A) multiply average flow velocity and volume of flow B) multiply shear stress and average flow velocity C) divide shear stress by average flow velocity D) divide average flow velocity by volume of flow
The Woods family uses about 10,000 kilowatt-hours of electricity annually. Coal-fired power plants release about 2 lbs. of carbon dioxide per kilowatt-hour of electricity produced
Wanting to be more environmentally "friendly," the family installs a solar photovoltaic (PV) system on their roof. They notice that the amount of electricity provided to them by their utility company has decreased by 60%. Assuming all of the utility company's electricity is generated from coal, how much less carbon dioxide is being produced annually as a result of the Woods installing their PV system? A) 8,000 lbs. B) 12,000 lbs. C) 20,000 lbs. D) It depends on how much carbon dioxide is being released by the PV system.