What is a major difference between the phosphorus cycle and the water, carbon, and nitrogen cycles?
A. The phosphorous cycle is much faster than the others.
B. The phosphorous cycle does not include the atmosphere but the others do.
C. The phosphorous cycle makes use of living organisms but the others do not.
D. The phosphorous cycle is able to create new energy.
E. The phosphorous cycle has not been impacted by human activity.
Answer: B
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China has considerable rare-earth metal reserves. Which situation is a problem for the U.S.?
A. They are stockpiling these reserves and reducing exports to meet their own needs. B. Since they are a critical component in a nuclear warhead, this situation could tip the nuclear balance in their favor. C. The mining and processing is causing pollution on a worldwide scale. D. China artificially depressed the price of these metals causing other producers to stop mining.
Why did multinational corporations establish offices in Johannesburg, then leave, and now have returned?
A. They came for the mining, left when the mines were no longer viable, returned as service industries developed. B. They came for low-cost labor, left because of the HIV epidemic, returned when the epidemic was under control. C. They came for diamonds, left because the currency collapsed, returned when white minority rule ended. D. They came for mining, left because of apartheid, returned when apartheid ended.
Which of these is the most important cause of the increase in atmospheric CO2?
A) decaying vegetation B) deforestation C) cattle D) wetlands and swamps E) burning of coal and petroleum
Freezing nuclei are a part of the ________________ process
Fill in the blank(s) with correct word