Why are resources distributed unequally over the earth?

The distribution of the minerals depends upon some factors such then when the earth was formed. The minerals were formed when the earth was being formed.

Geographical location is very important for the availability of the minerals. The areas where there is a high reaction of volcanoes will be rich in metallic minerals. It can be found when the volcano erodes away.

This heavy metallic mineral is mostly found in the core of the earth. But the lighter minerals silica and aluminium is found on the crust.