What is the name for a zone that decreases in temperature with depth?
A) Pycnocline
B) Thermocline
C) Halocline
D) Mixed layer
B
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A rock with only 25% of the parent isotope left has been decaying for time equal to ________ half-lives.
A. five B. four C. one D. three E. two
What technique increases oil and gas production from impermeable source rocks?
A. Hydraulic fracturing B. Hydraulic sorting C. Hydraulic drilling D. Seismic exploration
Using both primary and secondary petroleum recovery techniques, what proportion of the oil in an oil field is usually pumped out?
A. 1/3 B. 1/2 C. 2/3 D. all of it
In the twenty-first century, the United States has witnessed
A) the wealthiest one percent of the population control less of the wealth since the 1970s. B) the wealthiest one percent of the population control more of the wealth since the 1970s. C) little change in how much wealth the wealthiest control. D) the flight of wealth by the top one percent to Asia. E) the elevated tax rates on the wealthiest Americans to ensure equality.