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

[EX Q]: Stirring, surface area, and temperature affect the rate at solute dissolves what occurs.
[EX A]: Stirring, surface area, and temperature affect the rate at which what occurs?

[EX Q]: Fractional crystallization is the separation of compounds on the basis of their solubilities in a given solvent.
[EX A]: What is the separation of compounds on the basis of their solubilities in a given solvent?

[EX Q]: Liquid has a definite volume, but not a definite shape.
[EX A]:
What state of matter has a definite volume, but not a definite shape?