Answer:
What has a neck and no head, two arms but no hands?
You fill it and it empties, A metaphor for plenty, Depending on what half you see, It's either full or empty
What has roots that nobody sees, and is taller than trees. Up, up it goes, and yet it never grows.
What comes with your car, but travels more than your car?
What can go up but never come down?
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.