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.

[EX Q]: Fact: adding salt to a solid decreases the freezing point of that solid
[EX A]: Salt was at one time?

[EX Q]: Fact: high temperatures can cause an object to combust
[EX A]: A dry bush may burst into flames due to?

[EX Q]: Fact: contact between rocks over long periods of time causes rocks to smooth
[EX A]:
If a rub two rocks together after awhile they will start to?