Answer:
A harvest sown and reaped on the same day in an unplowed field. Which increases without growing, remains whole though it is eaten within and without. Is useless and yet the staple of nations.
Two little holes in the side of a hill. Just as you come to the cherry-red mill.
I am black when I am clean and white when I am dirty?
I'm sometimes white and always wrong. I can break a heart and hurt the strong. I can build love or tear it down. I can make a smile or bring a frown.
Though I have neither legs nor feet, my use is for to go; Although I cannot speak, I tell what others want to know
I’m grown from darkness but shine with a pale light. Very round I am and always a lady's delight.