Answer:
I touch the Earth, I touch the sky, but if I touch you, you’ll likely die. What am I?
Deep, deep, do they go. Spreading out as they go. Never needing any air. They are sometimes as fine as hair.
I am a daily ritual involving using a metal tool on the body
Use me if you really want to see inside someone
I am between earth and heaven. What am I?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.