Answer:
As a state in America I am round on both sides and high in the middle.
What gets sharper the more you use it?
What kind of room has no doors or windows?
My keepers feed me colored balls. With sticks they store on my den walls. Sometimes I store them in my pouch. Sometimes deep in my belly; ouch!
I am alive without breath and cold as death. I am never thirsty but always drinking. What am I?
What has to be broken before you can use it ?