cracking a rock and making a U-shaped valley making a dune and making a U-shaped valley making a dune and making a V-shaped valley cracking a rock and making a V-shaped valley
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: What are two ways ice can change Earth's surface?
Possibilities:
- cracking a rock and making a U-shaped valley
- making a dune and making a U-shaped valley
- making a dune and making a V-shaped valley
- cracking a rock and making a V-shaped valley

cracking a rock and making a U-shaped valley