Answer:
What starts with an 'e' and ends with an 'e' but only has one letter?
I store fire-breathing animals.
I build up castles. I tear down mountains. I make some men blind, I help others to see. What am I?
I am lighter than the material I am made of. You see parts of me but more of me is hidden underneath.
What happens when you throw a green stone into the Red Sea?
What language does a billboard speak?