Question

2016.
ghana mali cameroon
mauritania nigeria sierra leone
gold petroleum iron

Explanation:

This is a matching task that pairs West African countries with their key natural resources based on geographic and economic data:

1. Ghana and Mali are major gold producers in the region.
2. Nigeria is Africa's top petroleum exporter, and Cameroon also has significant petroleum reserves.
3. Mauritania and Sierra Leone are known for their iron ore mining industries.

Answer:

Gold: Ghana, Mali
Petroleum: Nigeria, Cameroon
Iron: Mauritania, Sierra Leone