Answer:
I'm white and used for cutting and grinding. When I'm damaged, humans usually remove or fill me. For most animals I am a useful tool. What am I?
I carry you down a gentle stream.
I fly yet I have no wings. I cry yet I have no eyes. Darkness follows me. Lower light I never see.
People walk in and out of me. They push me and I follow. When they walk out on me I close up and I stay waiting for the next person to walk into my life when I have a more open mind
I have lakes but no water forests but no trees and cities but no buildings. What am I?
A little house full of meat, no door to go in and eat.