They keep secrets locked away.
And you pass through them each day.
For each one there is a key,
They respond to sesame.
It starts at the earth's end and brink,
Filled with water you can't drink.
Has a color, just like ink,
Walk into it and you'll sink.
I transfer oxygen from the atmosphere to your blood. What am I?See answer
Select a pack of riddles and try to solve it in an interesting way.
This riddle appears in the following downloadable PDF files: