Answer:
I am commonly ate before I'm born and after I'm dead.
I am taken from a mine and shut in a wooden case from which I am never released. Yet I am used by almost everybody. What am I?
What goes up and down, but does not move?
I sleep by day, I fly by night. I have no feathers to aid my flight. What am I?
What is light as a feather but even the strongest man cannot hold it for more than a few minutes?
What never gets any wetter no matter how hard it rains?