Answer:
It is in every mountain, it's not in any hill, it's not in all the world, and yet it's in the mill.
Where humans breathe liquid.
Mouth up it gets filled, mouth down it gets empty.
The edge of earth and bread.
What is it that no man ever saw, which never was, but always will be?
When is it bad luck to see a black cat?
Easy
Easy
Animal
Difficult
Food
Funny
Kids
Logic
What am I?