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: some animals live in zoo exhibits
[EX A]: Some animals are housed?

[EX Q]: Fact: freezing point means temperature below which a liquid freezes
[EX A]: If you want to walk over a lake, which of these is necessary?

[EX Q]: Fact: weathering means breaking down surface materials from larger whole into smaller pieces by weather
[EX A]:
Even items such as rocks mass can be changed due to which process?