Which of the following statements is true?
A. Humans may have been causing extinctions for thousands of years, but our impact has recently increased.
B. Humans have never had significant impact on species extinctions until the past four decades.
C. Humans are responsible for many of the mass extinctions in the geologic record.
D. Humans only began causing extinctions in the past 150 years.
Answer: A
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The upper boundary of a confined aquifer is the:
a water table b. potentiometric surface c. artesian surface d. none of the above
According to this graph, which shows water balance for the Ogallala aquifer, which of the following statements are true?
A. As the aquifer dewaters, it expands, increasing the amount of pore space in which to store water. B. More water is taken out of the aquifer than is gained from recharge. C. Less water is taken out of the aquifer than is gained from recharge. D. Springs and rivers take out more water than does pumping.
When you thrust a magnet into a coil of wire you'll induce
A. voltage. B. current. C. both of these D. none of the above
The phrase "Jihad vs. McWorld" is intended to symbolize the struggle and tensions between
A) nutritious/traditional food and unhealthy/processed food. B) religious fundamentalists and secular capitalists. C) traditionally based cultural values and pop culture/shallow materialism. D) the local and the global. E) the North and the South.