What valuable commodity has yet to be commercially mined from ocean sediments?
a. Natural gas
b. Gravel
c. Diatomaceous earth
d. Manganese nodules
ANS: D
Manganese nodules have yet to be commercially mined due to their low market value. As techniques
for deep-sea mining become more advance and raw material prices increase, however, the nodules'
concentration of valuable materials will almost certainly be exploited. Information can be found in the
section Marine Sediments Are Economically Important.
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Which country in Latin America sends the largest number of legal immigrants to the United States?
A) Chile B) Brazil C) Colombia D) El Salvador E) Mexico
A diuretic does which of the following?
A) decrease urea production B) increase urea production C) decrease urine production D) increase urine production
Abyssal hills are single, rounded domes extending at least 3 km above the deep-sea floor.
Answer the following statement true (T) or false (F)
One after the other, if the land is used for two or more different purposes then the type of usage is defined as
A. conservation. B. multiple use. C. restrictive zoning. D. sequential use.