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.

Q: Fact: using a car causes pollution

A: Which form of travel causes the most pollution?
****
Q: Fact: breath contains water vapor

A: If someone wants to see if breath is moist, they can?
****
Q: Fact: earthquakes cause rock layers to fold on top of each other

A:
Which is more likely the result of a big earthquake?
****