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.

Example Input: Question: The outer shell of our planet is made of? Answer: sedimentary formations.
Example Output: Earth 's surface is made of rock

Example Input: Question: What could be used to fill a beach ball? Answer: Oxygen.
Example Output: a beach ball contains gas

Example Input: Question: All the water vanishes from a small depression basked in sunlight on a paved road because of? Answer: evaporation.
Example Output:
a phase change is when matter changes from one state into another state