Answer:
This thing all things devours: Birds, beasts, trees, flowers; Gnaws iron, bites steel; Grinds hard stones to meal; Slays king, ruins town, And beats high mountains down.
What stays on the ground but never gets dirty?
Lovely and round, I shine with pale light, grown in the darkness, a lady's delight.
You saw me where I never was and where I could not be. And yet within that very place, my face you often see.
My tongue hangs out as I run over fields and streets all day. I get tied up every morning and untied at night.
What sphinxes employ and players enjoy.