Minerals are non-renewable, as they take tens of thousands to millions of years to form. Any natural resource that is used at a faster rate than it forms is considered a non renewable resource. Examples of renewable resources are wind and timber that is harvested in a sustainable manner.
Resources are generally categorized into natural resources, human resources, mineral resources and biological resources. Some resources fall into more than one group. Natural resources are oceans, the atmosphere, forests, minerals, animals and fish. Human resources are biological resources and skills that humans develop. Mineral resources include all minerals, such as coal, oil, natural gas and metals. Biological resources such as plants and animals are the most vital resource necessary for human existence, because they support life.