Given a scientific question and its correct answer, generate supporting facts for the answer. This supporting fact can be an explanation for the answer to the given question.

[EX Q]: Question: Power in electricity is the voltage multiplied by what? Answer: the current
[EX A]: ; Power in electricity is the voltage multiplied by the current.

[EX Q]: Question: Instead of wood, what do some fireplaces use? Answer: propane
[EX A]: Some fireplaces use propane gas rather than wood as fuel.

[EX Q]: Question: The nitrogen cycle includes air, soil, and what? Answer: living things
[EX A]:
The nitrogen cycle includes air, soil, and living things.