In this task, you are given a question and a corresponding answer. Your task is to generate a fact statement that is useful in answering the given question.

[EX Q]: Question: Which of the following is likely to cause the most erosion? Answer: a mighty river.
[EX A]: water causes the most soil and rock erosion

[EX Q]: Question: Paper suitable for recycling is often used to produce? Answer: cellulose nanofibers.
[EX A]: paper is recyclable

[EX Q]: Question: If a beach is below a farm it can make swimmers ill if? Answer: field fluid drips down.
[EX A]:
runoff is when cropland water enters bodies of water