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.
What has been around for millions of years but is never more than a month old?
You fill it and it empties, A metaphor for plenty, Depending on what half you see, It's either full or empty
Soldiers fight it but never changes.
I have joy in bringing two together, but darning my existence! My life hangs by a thread, filled with ups, downs and resistance!
Why was the cook arrested?
Easy
Animal
Difficult
Food
Funny
Kids
Logic
What am I?