The main way in which trade is connected to the spread of culture and ideas between Egypt and Nubia is that traders would take goods from place to place that would intrigue the locals, who would then learn about the other culture, which encouraged some independent travel as well.
Trading aspects of culture. Learned paper making from Chinese and get the concept of 0 from India.
Sorry wrong answer :(
The narrow Nile Valley had less farmland; however , Nubia's geography included rich iron ore deposits and wood that provided fuel for smelting the ore into metal. They relied on trade for food, whereas the Egyptians did not.
