Answer:
It could make arrows fly and kites soar. What is it?
Proof you've done your time in school
Mouth up it gets filled, mouth down it gets empty.
He's small but he can climb a tower.
What is part of you and all around you but if it entangles you, it will kill you?
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.