Best riddles with simple answers

I have seas without water. I have forests without wood. I have deserts without sand. I have houses with no brick. What am I?

What goes through a door but never goes in and never comes out?

I am always hungry and will die if not fed, whatever I touch will soon turn red.

I am small. I can be scary. I have eight legs. I spin a web. 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.

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

I have a tail. I can fly. I'm covered in colorful feathers. I can whistle and I can talk. I am a...

What comes down but never goes up?

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

What can be swallowed, but can also swallow you?