Which of the following is a silicate mineral?
A. calcite
B. pyrite
C. galena
D. micas
Answer: D
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If a fusion reaction produces no appreciable radioactive isotopes, why does a hydrogen bomb produce significant radioactive fallout?
A) The fallout is only the radioactive remnants of the bomb's structure and casing. B) It is a misconception that fusion reactions produce no appreciable radioactive isotopes. Therefore, radioactive fallout is unavoidable. C) The radioactive fallout is a result of the fission reaction used to ignite the thermonuclear fusion reaction. D) Once a hydrogen bomb is exploded, all matter within nearly 100 miles becomes radioactive fallout.
Of the following, ________ has been most negatively impacted by globalization
A) public-health practices B) agricultural practices C) local cultures' religious and dietary traditions D) international travel E) the exchange of information
What percentage of wood harvested in Africa is consumed for fuel?
A) 20% B) 60% C) 10% D) 90% E) 40%
What happens to a river as it flows through a delta and encounters the sea? 
A. The maximum sediment grain size carried by the river increases. B. The total sediment load carried by the river decreases. C. The discharge and water velocity increase. D. All of these choices are correct.