Answer:
Cows do this to salt and humans do it to ice cream.
A white field, and when it is plowed, its soil is black.
What comes once in a minute, twice in a moment, but never in an hour?
A locked sphere without hinges or key. Break me open and golden treasures you'll see
I travel with deer all over the world and make the night special for all boys and girls. I happily drink milk and eat your cookies and then I give you all sorts of goodies. Who am I?
I appear in the morning. But am always there. You can never see me. Though I am everywhere. By night I am gone, though I sometimes never was. Nothing can defeat me. But I am easily gone.