i) Renewable resources:- Renewable resources are the natural resources which can be used against and again or can be reproduced by physical, mechanical and chemical processes. Solar energy, air, water and soil are some of the renewable resources of energy.ii) Non-renewable resources:- Non-renewable resources are the natural resources that cannot be replaced at all or within a reasonable time. Fossil fuels such as oil, gas and coal are examples of non-renewable resources. These resources accumulated over millions of years. They are considered to be non-renewable resources because once they are used up, they are gone forever.