Answer:
I fly yet I have no wings. I cry yet I have no eyes. Darkness follows me. Lower light I never see.
I build up castles. I tear down mountains. I make some men blind, I help others to see. What am I?
I am a pretty one, fluttering in the pale blue sky. Delicate, fragile on the wing, indeed I am a pretty thing. What am I?
You get embarrassed when you stand on me when everybody is watching. Women don't like to talk about the number they see on me. Everyone stands on me when nobody is around
I can be cracked, made, told, and played. What am I?
No matter how little or how much you use me, you change me every month.