how long ago did continental drift happen
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how long ago did continental drift happen
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how long ago did continental drift happen, how long did continental drift take, how did continental drift happen, how continental drift occurred, timeline of continental drift, when was continental drift first introduced, when was continental drift proven, when was continental drift discovered, when was continental drift accepted, what was the continental drift, facts about the continental drift, continental drift over time, when was continental drift proposed, the world before continental drift