Instructions: In this task, you are given a paragraph, and your task is to construct a question from the given passage. Construct question in such a way that (i) it is well explained in the paragraph, (ii) the words may/may not be present in the paragraph, (iii) it should start with what/how/describe. Avoid creating a question that (i) is just relevant to one or two sentences, and (ii) not relevant to passage. 
Input: Waves hit the coast. Waves have energy that pushes the water and sediment. The sediment can help erode land like sandpaper. Water washes the sediment back. Some sediment is left as sand. 
Output:
What happens during erosion by the ocean?