Answer:
If you have me, you want to share me. Once you share me, you won't have me. What am I?
If you lose me you may cause people around you to lose me too.
Marking mortal privation when firmly in place. An enduring summation inscribed in my face.
I have a few points but we're not competing. I'll help you win when you're eating.
My rings are not worth much, but they do tell my age. What am I?
It flows out of the soil, It burns you if it boils, And holds us in its coils, More valuable than gold, As black as it is old.