1. Unit 3.4 Pollution IGCSE Y7 SCIENCE Prepared by Ms Wong

2. What are the local pollution incidents in media? What substances caused the pollution? Where did they come from? What harm did they do? IGCSE Y7 SCIENCE Prepared by Ms Wong

3. Recent Local Pollutions IGCSE Y7 SCIENCE Prepared by Ms Wong

4. What are the causes of water pollution? IGCSE Y7 SCIENCE Prepared by Ms Wong → Outdated legislation Polluted river in squatter area Kampung Ara, Selangor → Destruction of water catchment → Non-treated polluted water

5. Air Pollution Burning fuels such as coal, oil and petrol produces carbon dioxide. Some coals contain sulfur which would produce sulfur dioxide and produces ACID RAIN. IGCSE Y7 SCIENCE Prepared by Ms Wong

6. Questions 1. What causes acid rain? 2. In many countries, sulfur is removed from coal before coal is burnt: a. Explain how this reduces air pollution. b. Will this completely prevent air pollution from the burning coal? Explain your answer. IGCSE Y7 SCIENCE Prepared by Ms Wong

7. Summary Pollution means adding harmful things to the environment. Untreated sewage causes water pollution. Burning fossil fuels causes air pollution. IGCSE Y7 SCIENCE Prepared by Ms Wong