[练习册] OG13-SC：121-140

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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.
  • splitting apart continents
  • the splitting apart of continents
  • split apart continents
  • continents split apart
  • continents that were split apart
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