Answer:
From house to house I go, sometimes narrow, sometimes wide. Whether there's rain or snow, I always stay outside. What am I?
A dragon's tooth in a mortal's hand, I kill, I maim, I divide the land.
What gets sharper the more you use it?
I get thrown in the air and will fall down. I get thrown down and I will rise in the air. What am I?
If a man carried my burden, he would break his back. I am not big but leave silver in my tracks. What am I?
No matter how little or how much you use me, you change me every month.