Given a scientific question, generate a correct answer to it.
One example is below.
Q: Who proposed the theory of evolution by natural selection?
A: darwin
Rationale: This is a direct fact that Charles Darwin proposed the theory of evolution.
Q: Geysers are created when what is heated beneath the earth's surface?
A:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
water