What type of resource is found in abundance throughout sub-Saharan Africa?

Oil

Explanation:

Oil accounts for 43.5 percent of resource-rich sub-Saharan Africa wealth, substantially less than in resource-rich comparators outside Africa, and land accounts for about 35 percent (Figure 4). Metals and minerals account for 27 percent for Zambia, 26 percent for South Africa, and 14 percent for Botswana.

the factors that the economies of the muslim empires prosper were:

1- land trade routes-located between three continents  

2- sea trade routes

trade contributed to the spread of muslim empires, and with that islamic culture led to a growing feeling of internationalism resulted in the transfer of technology, science, and other cultural forms.

money is the anwser i think