You will be given a definition of a task first, then an example. Follow the example to solve a new instance of the task.
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.

Fact: deep sea animals live deep in the ocean
Solution: Frilled sharks and angler fish live far beneath the surface of the ocean, which is why they are known as?
Why? The output question is related to the fact in that frilled sharks and angler fish are deap sea animals. The question is related to the fact so this is a good question.

New input: Fact: fossil fuels are a nonrenewable resource
Solution:
Fossil fuels?