7) Choice C is correct. The passage states that rising temperatures would decrease the amount of sea ice formed in the winter, and that this change would result in surface water that is less salty, and thus less likely to sink. The current situation, then, results in the opposite: surface waters that are more likely to sink. Choices A and D are incorrect because the passage gives no information about how fluctuating temperatures would affect less salty water or about the relationship between the Antarctic region and the rest of the planet. Choices B and E are incorrect because they are both the opposite of what the passage implies about surface waters in the current environment.
8) Choice A is correct. The passage states that, in Martinson’s scenario, the deep water would rise to the surface at a slower rate were warming to occur. He must believe, then, that the water currently rises to the surface more quickly. As for Choice B, while the passage indeed states that deep waters in Antarctica store heat, it also suggests that this heat would be less likely to reach the surface and worsen global warming. Choice B is therefore incorrect. Choice E is incorrect because it contradicts information given in the passage. Choices C and D are incorrect because, while the passage discusses the effects of global warming on the temperature and salinity of surface water, it gives no information of warming’s effects on the temperature and salinity of deep water.
9) Choice E is correct: according to the passage, “less sea ice would mean a smaller increase in the concentration of salt.” Choices B, C, and D are incorrect because they are all contrary to the information presented in the passage. Choice A is incorrect because the passage does not compare current amounts of sea ice with past quantities; it instead proposes a hypothetical scenario involving a possible future decline of sea ice formation.
Get the 17 FREE GREPrepclub Tests