14. a) Give five ways in which the discovery of iron technology affected the lives of Africas Communities during the pre colonial period (5ks) b) Explain five factors which contributed to industrialization of Germany in the nineteenth Century 15. State the main (10mks) advantage of wind as an early sourse of energy 16. Mention two confibution of Louis Payeur in the field of medicine 17. State one characteristic of the Industrial Revolution in Europe 18. a) Identify five effects of scientific inventions on Industry (5mks) (2ks) (mk) b) Discuss measures that can be taken by Third world countries in order to industrialize 19. Give two disadvantages of the use of coal as a source of energy. 29. Mention two negative effects of the scientific revolution on society, 21. (a) State how water was used as source of energy in early industries. (3mks), (b) Discuss the factors which have facilitated industrialization in Brazil, 22. Name two advantages of metal tools over stone tools, (2miks) (12mks) 23. State one theory that explains the spread of iron working in Africa during the 15% century 24. Identify two factors that facilitated the spread of iron working in Africa. 25. Identify the greatest contribution of Robert Koch in the field of science, 26. Give two reasons why coal was used as the main source of industrial power in Britain during the industrial revolution. (2psks) 27. What was the contribution of John Dalton in scientific discoveries?, 23. a) State five factors that facilitated the spread of iron working in Africa. Beened and designed by Mr. Otanga (5mks) Page 11​