- Mon Jan 25, 2021 2:44 pm
Answer D was what we sometimes call a "shell game" answer, Grace. That's where the authors take things from the passage and scramble them up in ways that the passage did not provide. In the passage, circulation was discussed, but it was circulation of the outer core fluid that mattered. Ocean temperatures were discussed as possibly contributing to reversals in polarity by making it easier for smaller asteroids to trigger the growth of the ice caps, but ocean circulation patterns were never mentioned. Since we are supposed to pick the one thing that was NOT mentioned as a cause, D is our winner!
Adam M. Tyson
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