Answer:
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 keep growing and am practically indestructible. I get eaten, but always come back. I survive cold and lie everywhere. You see me everyday. What am I?
In Paris but not in France the thinnest of its siblings.
I'm tall when I'm young and short when I'm old. What am I?
I am clean when Iām black dirty when Iām white.
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.