Answer:
I break down buildings, I crumble mountains but you can't see me. What am I?
I can wave my hands at you but I never say goodbye. You are always cool when with me even more so when I am high!
I am a daily ritual involving using a metal tool on the body
What is black when you buy it, red when you use it, and gray when you throw it away?
What has a face and two hands but no arms or legs?
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?