Why diverse natural resources in different regions in the country?

-You are far better off to post this under 'geology'.

Different rock formations with different mineral content have different histories, of which geologists have a far better understanding than do historians.

It has to deal with sedimentary rocks, igneous rocks and compaction. There are aggregate rocks as well.

Some formations got moved around and even formed by compaction due to glaciation. Glaciation ploughed up some rock formations in such ways as to make mineral extraction easier for humans while sometimes glaciation ploughed mineral deposits deeper into the crust of the earth making it more difficult to extract/mine.

Sedimentary rocks first appear in water courses and are usually fragile.

Igneous rocks are formed by heat - volcanic activity.

Compacted rock formation is the result of what we call 'petrification'. There are stages. Coal, for example, is the result of 'petrification' but the process is incomplete and thus humans extracting this 'mineral' can burn it as a fuel.

Aggregate rocks are sort of the 'mutts' in the group.Resources are formed over thousands to millions of years of processes deep within the earth. Volcanic eruptions, movements in the earths crust, etc. can bring all these natural resources to the surface of the earth, making them more accessible for us to remove.
I think the key term is 'natural'; the resources are where they happen to be naturally.