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
A doing sth=动词结构 和其他名词不平行
B 名词结构
C DONE结构 split apart continents=continents split apart =D
E 和其他名词不平行
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