Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

[EX Q]: Natural resource type of resource is limited in supply and cannot be replaced except over millions of years.
[EX A]: What type of resource is limited in supply and cannot be replaced except over millions of years?

[EX Q]: The best way humans can conserve water is to use less.
[EX A]: What's the best way humans can conserve water?

[EX Q]: Direction describing motion, what factor is just as important as distance.
[EX A]:
When describing motion, what factor is just as important as distance?