What am I riddles with simple answers

I dig out tiny caves, and store gold and silver in them. I also build bridges of silver and make crowns of gold. They are the smallest you could imagine. Sooner or later everybody needs my help, yet many people are afraid to let me help them. What am I?

I can sizzle like bacon, I am made with an egg, I have plenty of backbone, but lack a good leg, I peel layers like onions, but still remain whole, I can be long, like a flagpole, yet fit in a hole. What am I?

You can easily touch me, but not see me. You can throw me out, but not away. What am I?

I weigh almost nothing. I am lighter than air. But even the strongest man in the world cannot lift me. What Am I?

I have a little house in which I live all alone. It has no doors or windows, and if I want to go out I must break through the wall. What am I?

If I drink, I die. If i eat, I am fine. What am I?

I'm a soft and furry pet. I have four legs and a long tail. I have sharp teeth and claws. I like to chase mice. I am a...

Never was, I am always to be. No one ever saw me, nor ever will. And yet I am the confidence of all, to live and breathe on this terrestrial ball. What am I?

I am a seed with three letters in my name. Take away the last two and I still sound the same. What am I?

When you have me more, you can see only less. What Am I?