Answer:
You bind me and I walk. You loosen me and I stop. What am I?
I am what bring things together. Without me everything you see would be a total mass or debris everywhere.
Always in you, sometimes on you. If I surround you, I can kill you. What am I?
You use me between your head and your toes the more I work the thinner I grow.
I am rubber you can eat!
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.