Answer:
I build up castles. I tear down mountains. I make some men blind. I help others to see.
White fat and fluffy, May even look like a puppy. Seems heavy but is light, Floats about without a worry, But if it turns dark you have to hurry!
Once they sailed the sea, now they surf the web
Who has married many women but never has been married who is he
Pirates put their booty in it.
When is it bad luck to see a black cat?