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

[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?

[EX Q]: Plasma matter makes up most of the universe.
[EX A]: What type of matter makes up most of the universe?

[EX Q]: In the nuclear fusion process, two light nuclei combine to produce a heavier nucleus and great energy.
[EX A]:
In which process do two light nuclei combine to produce a heavier nucleus and great energy?