Answer:
I help engines spin and pants stay up. What am I?
I can be driven but have no wheels. I can be sliced but still remains whole
With a halo of water and a tongue of wood; stone as skin long I stood.
I sit in a corner while travelling around the world.
Cold head and feet; round as a ball; always turning around myself.
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.