Instructions: Based on the information present in the given passage, you need to write a correct answer to the given question. A correct answer is one that correctly and completely answers the question. Do not write answers that address the question partially or incorrectly. The correct answer must be contained in the given paragraph.
Input: Paragraph- Sent 1: Have you ever looked closely at a globe?
Sent 2: That continents look like a giant jig-saw puzzle.
Sent 3: North America looks like it could fit next to Europe.
Sent 4: The edge of South America matches Africa.
Sent 5: Scientists noticed these same features.
Sent 6: It caused them to start asking questions.
Sent 7: They wanted to know if these continents were was connected?
Sent 8: If so, how can something so large move so far?
Sent 9: What could possibly have enough force to move such a giant slab of rock?
Sent 10: Is there other evidence that can provide clues to the past positions of continents?
Sent 11: How can answering these questions help us?
Sent 12: A scientist named Alfred Wegener had these same questions.
Sent 13: Wegener look at rocks on both sides of the Atlantic Ocean.
Sent 14: He noticed they were the same type and age.
Sent 15: He thought that the rocks must have formed side by side.
Sent 16: He proposed that the rocks then drifted apart.
Sent 17: One part went with North America.
Sent 18: The other part stayed with Europe. 
Question: Why does Wegener propose the continents look like a giant jigsaw puzzle?.
Output:
They look like they could fit next to each other.