wind erosion then deposition plate movement then deposition wind erosion then water erosion water erosion then plate movement
I gave my students this multiple choice question: Two processes are involved in the formation of a sand dune. Which two processes best describe how a sand dune forms?

Only one answer is correct among these 4 choices:
- wind erosion then deposition
- plate movement then deposition
- wind erosion then water erosion
- water erosion then plate movement

Could you tell me which one is correct?

wind erosion then deposition