Answer:
I'm white, I'm round, but not always around. Sometimes you see me, sometimes you don't.
I have four wings but cannot fly. I never laugh and never cry. On the same spot always found, toiling away with little sound.
Who spends the day at the window, goes to the table for meals. And hides at night?
What month of the year has 28 days?
It's been around for millions of years, but is never more than a month old. What is it?
What never gets any wetter no matter how hard it rains?