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

Ex Input:
A crater can usually be found on the top of composite volcanoes.

Ex Output:
A crater can usually be found on the top of what kind of volcanoes?


Ex Input:
Dig a well allows people to access water in an aquifer that does not flow from a spring or a geyser.

Ex Output:
How can people access water in an aquifer that does not flow from a spring or a geyser?


Ex Input:
Supercontinents have formed at least five many times in earth history.

Ex Output:

Supercontinents have formed at least how many times in earth history?