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题目内容
题目材料：
The consensus among early-twentieth-century geologists that continents did not drift, collide, or fragment was so strong that contentions about continents' mobility from the time of Wegener (1924) and Holmes (1929) were initially rejected by the overwhelming majority. It is sometimes argued that this rejection was based on lack of mechanisms for such large-scale crustal mobility, but this is incorrect. There was a wide debate about possible mechanisms for continental drift, and in fact Holmes had laid out a remarkable account that foreshadowed plate tectonics. It was not until the 1960s, however. that new observations by geophysicists of symmetric sea floor striping started a shift towards acceptance of the plate tectonics theory, generating many testable predictions that profoundly affected the field of geology.
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