1. A definition of man-made resources is things made by humans. For example,paper is a man-made resource,because we made it. It is made out of trees,but it is man-made because we put it together. A definition of natural resources is a thing that we didn't make and it was made by nature. For example grass is a natural resource,because we didn't make it up or make it.
2. Water is considered a natural resource because it comes from evaporation and precipitation. We can't do those things.
3. I use water every day in many ways. Also I use trees every day. Last I use oil every day for electricity.