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39大陆分水岭是指北美洛矶山脉上的一道想象线，该线把大西洋流域和太平洋流域区分开来。40StudiesofthegravityfieldoftheEarthi
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40对地球引力的研究表明，在不寻常的负荷之下地壳和地幔会发生位移。r
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44给美国的新移民增加教育设施比任何社会运动都更多的激发了ElizabethWilliams的热情。45Quailstypicallyhaveshortrou
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