If there was a picture it would help but im going off information i know aboutweathering and ersion.
Yes, physical wearthing did create this arch because waves they carry sedoment pieaces away or off of that rock and it possible could have been frozen off. I belive the proces happen slowy just because of how (big or small which ever one) and it takes time to get an arch that big (or small) to be that shape.
I really tried my best to help you and i hope this is the answer your teacher is looking for! Good luck and please make sure to word it in your own words :)
