PLEASE HELP!Why Africa is very poor continent though it is very rich in natural resources?

Arguably, the world's poorest continent lags because of modern age colonialism, which severely affects its economic growth and development. ... For example, the policies of colonialism forced Africa to rely on imported goods as all the natural resources are drawn away by the wealthy nations.

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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.