Definition: Given a scientific passage and an answer, generate a question for the given answer.
Input: Passage: Pangaea has been breaking apart since about 250 million years ago. Divergent plate boundaries formed within the continents to cause them to rift apart. The continents are still moving apart. The Pacific is shrinking as the Atlantic is growing. The Appalachians ( Figure below ) are now on a passive margin. The mighty mountains have weathered and eroded to what they are today. Answer: 250
Output:
How many millions of years ago did pangaea begin breaking apart?