Answer:
What is it which builds things up? Lays mountains low? Dries up lakes, and makes things grow? Cares not a whim about your passing? And is like few other things, because it is everlasting?
What surrounds the world, yet dwells within a thimble?
A dragon's tooth in a mortal's hand, I kill, I maim, I divide the land.
A leathery snake, with a stinging bite. I'll stay coiled up, unless I must fight.
It is a path of cow juice spread across the sky but cannot be seen by the naked eye
I have two bodies joined together as one. When standing still I run and run.