Answer:
Where do fish keep their money?
I dig out tiny caves and store gold and silver in them. I also build bridges of silver and make crowns of gold. Sooner or later everybody needs my help yet many people are afraid to let me help them.
I have a little house in which I live all alone. My house has no doors or windows and if I want to go out I must break through the wall.
I am alive without breath and cold as death. I am never thirsty but always drinking.
I'm a god a planet and a measurer of heat. Who 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.