Definition: Given a scientific passage and an answer, generate a question for the given answer.
Input: Passage: Some resources can't be renewed. At least, they can't be renewed fast enough to keep up with use. Fossil fuels are an example. It takes millions of years for them to form. We are using them up much more quickly. Elements that are used to produce nuclear power are also non-renewable resources. Uranium, for example, which is rare. Sooner or later, it will run out. Answer: nuclear
Output:
Uranium is an example of a non-renewable resource used to produce what type of power?