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: the solar system contains the moon
[EX A]: In the 60's people watched on TV while for the first time people walked on?

[EX Q]: Fact: a complete revolution of the Earth around the sun takes one solar year
[EX A]: In a year there is a complete revolution around a?

[EX Q]: Fact: if the amount of available food and water decreases in an environment then animals may leave that environment to find food and water
[EX A]:
Which event can lead to the human caused change of an environment?