In this task, you are given a fact statement and question based on the fact. Your task is to generate the correct answer for the question. The answer needs to be generated using the context fact statement.
--------
Question: Fact: An example of weathering is when a plant root grows into a crack in rock. Question: Weathering could be?

Answer: changing a statue to dust


Question: Fact: pencil lead contains mineral graphite. Question: What does pencil lead contain?

Answer: stable carbon


Question: Fact: each of the moon 's phases usually occurs once per month. Question: A boy is waiting to see a full moon. He notes that the full moon is tonight, and looks at it. If he wants to see another, he must wait?

Answer:
a month