Best easy riddles with simple answers

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?

Think of a number. Double it. Add ten. Half it. Take away the number you started with. What is your number?

What kinds of stones are never found in the ocean?

Even if you give this to someone else, you still get to keep it. What is it?

Dipping, glinting, gliding by, Rainbow-fretted, wrought of breath. I live only while I fly – Earth’s rough kiss my sudden death.

Some months have 30 days, and some months have 31 days. How many have 28?

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?

What country makes you shiver?

It is a city that has no people! What is that?

You are in a cold house in the winter. It is dark. You have one match. There is a candle and there is a wood burning stove. Which do you light first?