Answer:
I can sizzle like bacon. I am made from an egg. I have plenty of backbone but lack a good leg. I peel layers like onions but still remain whole. I can be long like a flagpole yet fit in a hole.
I turn everything around but I cannot move. When you see me you see you!
I help engines spin and pants stay up.
I go through a door but never go in and never come out.
You throw me away, I find my way back. Traditionally, I'm wooden with an arch in my back. What am I?
It flows out of the soil, It burns you if it boils, And holds us in its coils, More valuable than gold, As black as it is old.