Answer:
I build up castles. I tear down mountains. I make some men blind, I help others to see. What am I?
I have thirteen hearts but no body or soul.
When it comes to me you go on red and stop on green.
I am the second L in LOL.
You shoot me but I don't die. You hang me but I don't die. What am I?
Written on with words of white, Has the color of the night, Is the teacher's best delight, And a student's daily fright