Answer:
My days are numbered. What am I?
From house to house I go, sometimes narrow, sometimes wide. Whether there's rain or snow, I always stay outside. What am I?
I am heavy forward but backward I am not. What am I?
I have to be broken before I can be used
I am the key that is the hardest to turn
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.