Both capital and natural resources can be used to produce other goods and services, but only capital resources:

Only capital resources can help to transform with the use of skilled labour, the natural resources so they can be in a usable form to produce other goods and services. For example an open pit  copper mine, will use the skilful operators to load and haul and concentrate the mineral from which copper is extracted and then the smelter workers will refine the copper metal and then that copper can be used for wiring houses for example to provide electricity for both residential and commercial uses.