Answer:
I am believed to be only one dimensional, and tinier than anything can be, and there are many who say that I am the basis of all that we see. What am I?
Not born, but from a Mother's body drawn. I hang until half of me is gone. I sleep in a cave until I grow old. Then valued for my hardened gold.
What measures out time. Until in time all is smashed to it?
Come up and let us go. Go down and here we stay
It can pierce the best armor and make swords crumble with a rub, yet for all its power It can't harm a wooden club.
I can only be played on a windy day
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?