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: the Earth being tilted on its axis causes ones side of the Earth to receive less energy from the Sun than the other side
The earth receives uneven amounts of UV rays due to?

Fact: condensing causes a liquid to form
Which is the best example of condensation?

Fact: grass snakes live in grass

Where do grass snakes live?