Study all vocabulary words!!!!!

Possible short answer questions:

1-Explain what the two most valuable minerals in ancient Ghana were and how they were used?
2-What are rift valleys and how are they formed?
3-Explain the effects Europeans had on Africa. (Discuss slavery, missionaries, and colonization)
4-How did European slave trade affect life in this region?
5-Explain the difference of a renewable and nonrenewable resource. Give at least two examples of each.
6-Describe the four climamatic regions of Africa south of the Sahara.
7-Explain how Nigeria and South Africa gained their independence
from Great Britain.