Answer:
What goes up when the rain comes down?
I call the trees my home, yet I never go inside, and if I ever fall off the tree I will be surely be dead.
What is at the end of every rainbow?
What is always on its way but never arrives?
Watches students at the prom to make sure there's no funny business.
I am the fountain from which no one can drink. For many I am considered a necessary link. Like gold to all I am sought for, but my continued death brings wealth for all to want more.