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

Ex Input:
The seven unique crystal types are defined by faces parts of themselves (parts that intersect at various angles).

Ex Output:
The seven unique crystal types are defined by what parts of themselves (parts that intersect at various angles)?


Ex Input:
Gravity makes soil and rock particles move gradually down the slope during each thaw.

Ex Output:
What makes soil and rock particles move gradually down the slope during each thaw?


Ex Input:
It would help conserve water to turn off water while brushing teeth.

Ex Output:
Which would help conserve water?