I am often invisible underground. I am...
Riddle: I am often invisible underground. I am vital to life, but I make no sound. What am I?
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Riddle of the Day
You want to send a valuable object to a friend. You have a box which is more than large enough to contain the object. You have several locks with keys. The box has a locking ring which is more than large enough to have a lock attached. But your friend does not have the key to any lock that you have. How do you do it? Note that you cannot send a key in an unlocked box, since it might be copied.