Answer:
Sometimes black, sometimes white, I have veins but no blood
In many years, not much has happened. In many minutes, a lot has happened. In one second, everything has happened.
When there is fire in me then I am still cold. When I own your true love’s face then you will not see me. To all things I give no more than I am given. In time I may have all things, and yet I can keep nothing.
Although my cow is dead, I still beat her What a racket she makes.
The more of them you take, the more you leave behind. What are they?
I’m grown from darkness but shine with a pale light. Very round I am and always a lady's delight.