Answer:
Iron roof, glass walls, I burn and burn but never fall. What am I?
I dig out tiny caves and store gold and silver in them. I also build bridges of silver and make crowns of gold. Sooner or later everybody needs my help yet many people are afraid to let me help them.
Many people own a copy of me. Without me the world would fall.
Send poorly behaved children to me and let them sit here. What am I?
I will go within you and destroy you. Only because you wanted me too
Runs over fields and woods all day. Under the bed at night sits not alone, With long tongue hanging out, Resting at your feet until we go for a walk