Short simple riddles

This is a piece of jewelry Most often worn by girls It's sometimes gold or silver And sometimes made of pearls What is it?

I hiss. I can be poisonous. I am long. I have a forked tongue. What am I?

You can see me in water, but I never get wet. What am I?

I have no life, but I can die, what am I?

What always comes into a house through the keyhole?

I'm tall when I'm young and I'm short when I'm old. What am I?

What happens when you throw a blue rock into the yellow sea?

What was the biggest island in the world before the discovery of Greenland by viking Erik the Red?

At night they come without being fetched. By day they are lost without being stolen. What are they?

What comes down and goes up again and again? What is that?