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The second is the largest thing on earth, Sand?Dirt?Ground?
The thing to which we all owe our first birth.
The softest thing it looketh to the eye,
But lo! It tramples mountains standing...

The only other thing my mind keeps going back to is Time, from that one riddle from The Hobbit. :pullhair:

"The second is the largest thing on earth, Wind?Air?Breath?
The thing to which we all owe our first birth.
The softest thing it looketh to the eye,
But lo! It tramples mountains standing...