The wind in the desert blows sand against a rock. A glacier picks up boulders as it moves. A flood washes over a riverbank, and the water carries small soil particles downstream. An icy winter causes the pavement in a road to crack.
I gave my students this multiple choice question: All of the following are examples of erosion EXCEPT:

Only one answer is correct among these 4 choices:
- The wind in the desert blows sand against a rock.
- A glacier picks up boulders as it moves.
- A flood washes over a riverbank, and the water carries small soil particles downstream.
- An icy winter causes the pavement in a road to crack.

Could you tell me which one is correct?

An icy winter causes the pavement in a road to crack.