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

[EX Q]: In a carbon triple bond, three pairs of electrons are shared.
[EX A]: In a carbon triple bond, how many pairs of electrons are shared?

[EX Q]: Cloudy conditions will most likely result from a low-pressure weather system.
[EX A]: Which will most likely result from a low-pressure weather system?

[EX Q]: Carbon dioxide does not rise like other gases because it has a density greater than air.
[EX A]:
Carbon dioxide does not rise like other gases because it has a density greater than what?