Please choose the correct answer to the question: All of the following are examples of erosion EXCEPT:

Answer1: The wind in the desert blows sand against a rock. Answer2: A glacier picks up boulders as it moves. Answer3: A flood washes over a riverbank, and the water carries small soil particles downstream. Answer4: An icy winter causes the pavement in a road to crack.

Answer format: answer1/answer2/answer3/answer4