It's called "circulation wear". That happens to most coins after they've been in circulation for a while. Thanks for posting.
No prob. As Frog says, you can see the scratch marks all over it. Keep searching and Keep posting. We love photos.
One caveat - we like "decent and clear photos". OP's are not too bad. Much better than some we see around here.
This is not a Wyoming quarter. A Wyoming quarter is a state quarter. The Yellowstone quarter is an ATB (America the Beautiful) national parks quarter, lower mintage. A keeper in better condition.
Your name is so fitting for a web site devoted to coins....Pennie Lira Is that your real name or your Coin Talk !! name ?