resources are unevenly distributed because of differences in their physical make up i.e. geology relief soil and climate.
Geological structure: It determines the mineral resource base and topographical differences ensure diversity of crops and animal raised. Lowland have greater agricultural potential. Mountains attract tourist and promote tourism.
Mineral resources: They are unevenly distributed the world over. the availability of mineral resources provides the basis for industrial development.
Climate: It Influences the type of flora and fauna that can survive in given region. It also ensures diversity in the range of various product e.g. woo; production can take places in cold region, bananas, rubber and cocoa can grow in tropical regions.
population factor: the size, distribution and diversity of people also affect the trading between or among the countries.
cultural the culture of different countries also affect trading like carpets of Iran are also well known.