Allow the characteristics of the stages of a river in terms of the following. [10 marks] Description Youthful stage Middle stage Old stage

Here are the characteristics of the stages of a river and the economic importance of rivers in Africa. 10. Outline the characteristics of the stages of a river in terms of the following: | Description | Youthful stage | Middle stage | Old stage | | :------------------- | :------------------------------------------- | :----------------------------------------------- | :----------------------------------------------- | | Gradient/slope | Steep | Moderate | Gentle/Flat | | Water speed | Fast | Moderate | Slow | | Shape of the valley | Narrow, deep, V-shaped | Wider, U-shaped, some lateral erosion | Very wide, flat floodplains, gentle slopes | | Erosion or deposition | Vertical erosion (downcutting) is dominant | Both vertical and lateral erosion, some deposition | Deposition is dominant, significant lateral erosion | 11. Explain three ways rivers contribute to Africa are of economic importance. [3 marks] 1. Agriculture and Irrigation: Rivers provide a crucial source of water for irrigating agricultural lands, enabling the cultivation of crops and supporting food security and livelihoods for millions of people across Africa. 2. Hydroelectric Power (HEP) Generation: Many African rivers, such as the Nile, Congo, and Zambezi, have significant potential for hydroelectric power generation. Dams built on these rivers produce electricity, which is vital for industrial development, urban centers, and improving the quality of life. 3. Transportation and Navigation: Rivers serve as natural waterways for transporting goods and people, especially in regions with limited road or rail infrastructure. This facilitates trade, commerce, and connectivity between different areas, reducing transportation costs.