67 B Lets go through the answer choices A is used to turn steam into water

67 b lets go through the answer choices a is used to

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67. B Let’s go through the answer choices. (A) is used to turn steam into water so that it can be turned back into steam and spin the turbines. (C) is the site where the heat from the core heats water, turning it into steam that spins the turbines. (D) contain uranium, which is the fuel. Turbines, (E), generate electrical power and are not directly connected to the reactor. Control rods contain compounds, such as cadmium, that absorb neutrons; this reduces their ability to perpetuate a chain reaction. 68. D Riparian zones are the areas of vegetation that abut a river or stream. They form a corridor of vegetation along the banks of the river or stream. They increase habitat diversity for organisms living in or near the water and can absorb excessive nitrogen, phosphorous, and pesticides, preventing them from entering the water. 69. A Trawling involves dragging a net across the ocean floor. This disrupts the habitat and catches a wide variety of bottom-dwelling species. Drift nets float in the water; long lines include baited hooks, and they are towed behind boats; purse-seine catches surface fish as a net is drawn up from below; and fish farming is the growth of fish, from egg-stage to the point of harvest, in confined pens. 70. A In 1987, 36 nations met in Montreal and signed the Montreal Protocol, which cut the emissions of CFCs by about 35 percent between 1989 and 2000. In 1992, the protocol was updated in a meeting in Denmark to accelerate the phasing out of ozone-depleting chemicals. (B): Kyoto Protocol dealt with CO 2 levels. (C): CAA affected the United States only. (D): The Rio Earth summit dealt with many global environmental problems, but Montreal was specific to ozone depletion. (E): This refers to the U.S. “Superfund” Act. 71. D Bioaccumulation is the process by which chemicals remain and accumulate in the bodies of animals. These chemicals come from food and cannot be metabolically removed from the tissues. Generally, they are fat-soluble in nature. Biomagnification occurs when a predator eats several organisms and
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each individual prey has a bit of the chemical in its tissues. Bioaccumulation and biomagnification work together to increase the levels of toxic materials in the bodies of animals. Bioremediation is the removal of toxic compounds by living organisms. 72. A A reduction in the creation of pollution is always the least expensive method. (E) is impractical because air pollution can still spread to other areas. (D) does not help acid deposition on land and in the atmosphere. (C) is not possible, and (B), taller stacks would just spread pollution to other locations. 73. B Gamma radiation can penetrate most materials, and of the listed forms of radiation, is most harmful to humans. When it gets into a cell and damages the DNA, cancer can result. (A): Alpha rays can be stopped by a piece of paper. (C): Beta rays can be stopped by wood or clothing. (D): Infrared radiation is heat, as comes from a stove. (E): Radon is not a form of radiation; it is an element that can produce radiation.
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