The oldest rocks in the column of limestone shown in the diagram are
A. at the bottom.
B. in the middle.
C. at the top.
Answer: A
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Light-water reactors
A. move control rods in and out of the reactor core to absorb neutrons. B. use a heating fluid to raise the temperature of the reactor. C. release radioactivity into the atmosphere to prevent explosions. D. produce and mine uranium to make fuel. E. store the spent radioactive waste safely.
The wind-chill factor
A) can be measured by a thermometer. B) takes into account the loss of heat due to wind. C) was recently discovered to be even more severe than previously thought. D) is most important in hot weather. E) all of the above
Which of these countries is experiencing the greatest stress from overuse of its surface water?
A. Saudi Arabia B. Great Britain C. Canada D. Brazil
Which of the following statements is FALSE regarding the Syrian Civil War?
A) millions of Syrians have been displaced and more than 220,000 have been killed as a direct result of the war B) ISIL gained control of wide swaths of Syrian territory in the east C) Israeli forces have occupied much of southern Syria to provide a defensive buffer against ISIL expansion D) Russia has come to the military aid of the Assad regime E) Syria has witnessed the destruction of many of its cultural and historical landmarks