Short easy simple riddles for teens

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

I eat other animals. I have a big mouth. I am green. I live in the water. Who am I?

What has a neck but no head?