Answer:
I'm white and I'm used for cutting and grinding. When I'm damaged people usually remove me. What am I?
I go in dry and come out wet. The longer I stay in the stronger my surroundings get.
I'm not a bird but I can fly through the sky. I'm not a river but I'm full of water.
I fly forever Rest never.
What goes through cities and fields but never moves?
Runs over fields and woods all day. Under the bed at night sits not alone, With long tongue hanging out, Resting at your feet until we go for a walk