Answer:
It increases and decreases yet no one see it. It is not a fire and yet it can be quenched.
What buildings have the most stories
What do you call a fish without an eye?
There was a plane crash and every single person died. Who survived?
What has 2 banks but no money?
Who makes it, has no need of it. Who buys it, has no use for it. Who uses it, can't see it. What is it?