Best short riddles for teens

I plow and plow, but never sow. What am I?

Thousands lay up gold within this house, but no man made it. Spears past counting guard this house, but no man wards it.

If you multiply all the numbers on the telephone, what is the answer?

Billy was born on December 28th, yet his birthday is always in the summer. How is this possible?

I am alive without breath and cold as death. I am never thirsty but always drinking. What am I?

I live in the ocean. I swim wherever I want. I sing to my family. I can breathe through a hole in the top of my head. I am a...

I am small and shy. I have eight legs. I eat bugs. I catch them in my web. I am a...

Imagine you're in a room that is filling with water. There are no windows or doors. How do you get out?

I live in a house. Each Halloween I stand in a jack-o-lantern and get shorter as I grow old. What Am I?

Forward I am heavy, but backward I am not. What am I?