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]: It takes about one year for earth to orbit the sun.
[EX A]: Which of these takes about one year to complete?

[EX Q]: The eighth planet from our sun is neptune.
[EX A]:
What is the eighth planet from our sun?