What am I riddles for teens with simple answers

I am something to make you think, I am something to make you know. I am something to which the answer you might never know. 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?

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?

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?

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

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

I’m at the beginning of the end and the start of eternity, at the end of time and space, in the middle of yesterday but nowhere in tomorrow. What am I?

I'm very, very big. I like to eat peanuts and hay. I have four legs and two big ears. My long nose is called a trunk. I am an...