Answer:
I can be quick and then I'm deadly, I am a rock, shell and bone medley. If I was made into a man, I'd make people dream, I gather in my millions By ocean, sea and stream.
It is a part of us, and then replaced. It escapes out bodies, to a better place. The world becomes its sizeable home. Its passions unrestraint, the planet it roams.
Sometimes black, sometimes white, I have veins but no blood
What is lighter than what it is made of?
What can go through glass without breaking it?
You use it between your head and your toes, the more it works the thinner it grows.