Answer:
I break down buildings, I crumble mountains but you can't see me. What am I?
I begin with the letter āiā, if you add āaā in front of me, I become a new word with a different meaning, but still sounds exactly the same. What word am I?
Without me everyone would lose their head.
I can fly but I have no wings. I can cry but I have no eyes. Wherever I go, darkness follows me. What am I?
You have to travel far before you turn it over. What is it?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.