Answer:
I build up castles. I tear down mountains. I make some men blind, I help others to see. What am I?
I pass before the sun, yet make no shadow. I'm all around you, but you cannot see me. What am I?
I am very afraid of doing scary activities.
you can throw me away but I will always be coming back
I am a nut with a hole
It weighs next to nothing but no one can hold it for long. What is it?