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]: The sun and the moon appear to be about the same size in the sky because the moon is smaller in diameter and is closer to earth than the sun.
[EX A]: Which statement best explains why the Sun and the Moon appear to be about the same size in the sky?

[EX Q]: Gases in the air allows us to hear sound.
[EX A]:
What in the air allows us to hear sound?