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Given a scientific passage and an answer, generate a question for the given answer.

Passage: By 180 million years ago, Pangaea began to break up. The continents started to drift apart. They slowly moved to where they are today. The movement of the continents caused Panthalassa to break into smaller oceans. These oceans are now known as the Pacific, Atlantic, Indian, and Arctic Oceans. The waters of all the oceans are connected. That's why some people refer to the oceans together as the "World Ocean. ". Answer: break up
Output:
By 180 million years ago, pangaea began to do what?