(i) Natural Resources The resources which are directly obtained from nature and used without modification are called natural resources.
For example, the air we breathe, water in rivers and lakes, soils, minerals, sunlight, animals, etc are natural resources.
(ii) Human-Made Resources When human beings change the original form of natural resource to make it more useful, it is called human-made resource. For example, use of natural resources for making buildings, roads, machinery, etc.
(iii) Human Resources Human resource refers to the number and abilities of the people. People themselves are human resources.