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: a source of something supplies that something
a retailer gets an order of aluminum delivered weekly. Where is the aluminum likely coming from?

Fact: a compass is used to navigate seas
A compass would be useful to?

Fact: a revolution is when something revolves around something else

a revolution is when something revolves around?