Given a fact, create a question that can be answered using the fact. Construct the question such that it is unambiguous, has a unique answer and the answer can be given using the fact.

Input: Consider Input: Fact: a phase change is when matter changes from one state into another state

Output: All the water vanishes from a small depression basked in sunlight on a paved road because of?


Input: Consider Input: Fact: a prism refracts light

Output: A beam of sunlight strikes a stained glass window and?


Input: Consider Input: Fact: renewable resources can be used over again


Output: Renewable resources?