2013_Fall_Exam3_WTK(1)

57 ga the fossil record shows that at the beginning

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Unformatted text preview: igraphic units ‘A’ and ‘B’ is called a (an) . . . ? On what basis do geologists conclude that the Earth formed about 4.57 Ga? The fossil record shows that at the beginning of the Cambrian (i.e., at 542 Ma), . . . How does oceanic crust differ from continental crust? The deepest places in the ocean are ________, where water depths reach _________ . Which of the following statements about ocean currents is correct? Which of the following statements about the tides is correct? From the center of Earth to the surface of Earth, we have: Who discovered Earth’s inner core, when, and how? Why...
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