I. Answer the following questions 1. Which African region stands first by fresh water availability?
2. What are sources of water?
3. How do you define soil?
4. Identify the natural and human made source of air pollution.
5. Write 3 examples of non-renewable resources,
6. What is ecosystem?
7. Give one example for inorganic fertility.
8. Write the uses of plants.
9. Explain the different forms of erosion in brief?
10. What are the major factors that affect wild animals?
11. Give 3 examples for renewable resources.
12. Explain the difference between afforestation and reforestation,
13. What are the causes of urban in air pollution?
14. Mention the major factors that affect natural vegetation.
15. How much percent of earth's surface covered by water?
II. Give 3 examples for each of the following animals
16. Extinct
17. Omnivores
18. Arboreal
19. Endemic
20. Carnivore

1.Central Africa

2.Ground water, Rain water, surface water, ocean, snow melt.

3.Part of the earth that plants grow and it is a mixture of organic matter, minerals and many elements.

4. A) Natural:  Marsh gases, volcanic dusts, green house gases and pollen.

   B) Human: Burning fossil fuels, not using mass transport

5. Minerals, fossil fuels

6. Ecosystem is the relation ship between living things and non living things.

8. Balancing the ecosystem

9. Gulley erosion and sheet erosion

10. Illegal hunting, deforestation, Forest fires.

11. Air, wind power, geothermal power, solar power

12. Afforestation: Planting trees where nothing was planted before

    Reforestation: Planting trees whenever they are cut.

13. Industries & vehicles.

14. Deforestation & overgrazing.

15. 70%

16. Dinosaurs, dodo bird.

17. Bears, rats

18. Gorilla, monkey and apes

19. Walia Ibex, Nyala, Menelik's bush-buck & red fox.

20. Lion, Tiger and leopard

Hope it helps

i am confused, what is the question? i can you out if you put it into more depth.

answer; collective security;