Natural resources are gifted by nature for human uses causing no harm to the enviroment but the man made resources are the resources made by man for welfare of her self causing harm to the enviroment for example electricity are produce by building a dam due to this aquatic ecosystem are affected causing lesser growth of aquatic animals even some species become extinci due to stop dam and also when the water level is high in dams due to heavy rainfall the dams are open resulting flood rising causing death of human beings , animals and also pollution is also is also increase.......hope it help to understand