What was the main cause of continental drift?

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Scientists believe that Earth’s continents were once joined together into a single landmass called Pangaea. This supercontinent began to break up 175 million years ago and slowly drifted apart in a process known as continental drift to form the separate continents we see today. This diagram shows what Pangaea is believed to have looked like and how the continents drifted apart to appear as they do today.

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What was the main cause of continental drift?