The number of people served by advanced wastewater treatment plants doubled between 1968 and the mid-1990s, but because the treatment plants _______________________, the quantity of waste emitted into the water after treatment ___________________ .
A. became so much more effective; decreased by about one-third
B. became so much less effective; increased by about one-third
C. remained ineffective; remained the same
D. moderately improved; increased by 10%
Answer: A. became so much more effective; decreased by about one-third
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Air pressure is:
A) measured in pascals by American meteorologists. B) independent of the density of air. C) independent of the temperature of air. D) the sum of the partial pressures of its constituent gases.
Which of the following is true?
A) World grain production has remained stable since 1985. B) World hunger has increased significantly since 1970. C) Aquaculture has decreased significantly since 1985. D) The main reason why people are undernourished is because they are not educated about proper nutrition. E) More than one in three adults in the United States is obese.
Which of the following is true of glucitol?
A) It exists only as an open-chain structure. B) It exists only as a ring structure. C) It exists as both ring and open-chain structures with the open-chain structure predominating. D) It exists as both ring and open-chain structures with the ring structure predominating.
Transform plate boundaries are places where two plates slide past each other. What would happen to the transform boundary if the direction of plate motion changed such that the two plates were pushed towards each other?
a) The transform boundary would stop plate motion from changing direction. b) The transform boundary would turn into a convergent boundary. c) The transform boundary would turn into a divergent boundary. d) New oceanic crust would be produced at the transform boundary. e) The directions of plate motions are fixed, so the transform boundary would not change.