What Am I Riddles

Question: I can go up a chimney down but not down a chimney up?

What am I?

Question: The shorter I am, the bigger I am.

What am I?

Question: If a man carried my burden, he'd break his back.
I am not rich, but I always leave silver in my track.

What am I?

Question: I tear paper but I'm not mad,
I wear a purse but it's not a fad.

Who am I?

Question: I make up all literature, but I'm often sealed.

What am I?