What percent of the commercial energy consumed in the world comes from nonrenewable energy sources?
A. 40%
B. 51%
C. 72%
D. 92%
E. 100%
Answer: D
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Why isn't manganese mined on the seabed when there are abundant manganese nodules in some parts of the ocean floor?
A) The manganese market is held by a global cartel who prevent the material from being mined. B) It is not economical to mine manganese nodules at present-day world prices for manganese and associated metals in nodules. C) The manganese is too difficult to extract from the nodules; a new technology is needed. D) It is impossible to extract the nodules from the seafloor with present-day technology.
Clastic sedimentary rocks are formed
A. from the broken-up fragments of preexisting rocks. B. at very high temperatures because the grains must be fused together to make rock. C. from chemicals dissolved in solution. D. All of the choices are correct.
The common nonsilicate mineral groups include
A. carbonates. B. oxides. C. sulfides. D. sulfates. E. halides. F. All of these choices are correct.
Exploitation of which of the following gold deposits did NOT pollute the environment with cyanide?
a. Zortman-Landusky Mine, Montana b. Omai Mine, Guyana c. Amazon Basin, Brazil d. Summitville, Colorado e. Baia Mare, Romania