Answer:
Face with a tree, skin like the sea. A great beast I am. Yet vermin frightens me.
I work when I play and play when I work.
What's black when you get it, red when you use it, and white when you're all through with it?
I am free for the taking. Through all of your life, though given but once at birth. I am less than nothing in weight, but will fell the strongest of you if held.
What can go through glass without breaking it?
This food is a tortilla filled with cheese and sometimes chicken before being heated or cooked.