Answer:
I build up castles. I tear down mountains. I make some men blind. I help others to see.
What goes through a door but never goes in. And never comes out?
What's black when you get it, red when you use it, and white when you're all through with it?
What bird can lift the heaviest weight?
You can hold it without using your hands or arms. What is it?
This food is a tortilla filled with cheese and sometimes chicken before being heated or cooked.