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

[EX Q]: Unlike ammonia, oxygen cannot be liquefied at room temperature because its critical temperature is below room temperature.
[EX A]: Unlike ammonia, oxygen cannot be liquefied at room temperature because its what is below room temperature?

[EX Q]: Constructive forces type of forces are involved when deposited rock forms deltas or barrier islands.
[EX A]: What type of forces are involved when deposited rock forms deltas or barrier islands?

[EX Q]: Urine is the term for liquid waste formed by kidneys.
[EX A]:
What is the term for liquid waste formed by kidneys?