Is there a question that goes with this?
Answer: 1. back, 2. up, 3. about, 4. in, 5. round, 6. out, 7. back, 8. round, 9. up, 10. out, 11. in.
Explanation: hope this helps :)
Answer:
i think it's option b bcz it says it produces change in the shapes of these mountains.