Answer:
What must be in the oven yet can not be baked? Grows in the heat yet shuns the light of day? What sinks in water but rises with air? Looks like skin but is fine as hair?
I have it, I donโt share it. If I share it, I donโt have it. What is it?
Big as a biscuit, deep as a cup, but even a river canโt fill it up. What is it?
Iron on a mammal. Mammal on your feet.
What surrounds the world, yet dwells within a thimble?
Iโm grown from darkness but shine with a pale light. Very round I am and always a lady's delight.