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

[EX Q]: Air is made of atoms.
[EX A]: Which of the following is made of atoms?

[EX Q]: The frequency of a wave is the reciprocal of the period of the wave.
[EX A]: The frequency of a wave is the reciprocal of what other attribute of the wave?

[EX Q]: One of the properties of an air mass is that an air mass has similar temperature and moisture properties throughout it.
[EX A]:
Which of the following is true regarding the properties of an air mass?