New theories propose that catastrophic impacts of asteroids and comets may have caused reversals in the Earth's magnetic field, the onset of ice ages, splitting apart continents 80 million years ago, and great volcanic eruptions.
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Asplitting apart continents
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Bthe splitting apart of continents
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Csplit apart continents
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Dcontinents split apart
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Econtinents that were split apart
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显示答案
正确答案: B