2. LEFT CLICK OR PRESS SPACE BAR TO ADVANCE, PRESS P BUTTON TO GO BACK, PRESS ESC BUTTON TO END LEFT CLICK OR PRESS SPACE BAR TO ADVANCE, PRESS P BUTTON TO GO BACK, PRESS ESC BUTTON TO END COMPUTER PRESENTATIONS FOR KS3 SCIENCE - CHEMISTRY ©2003, STEVE PARKER COMPUTER PRESENTATIONS FOR KS3 SCIENCE - CHEMISTRY ©2003, STEVE PARKER

3. 1 1 KS3 SCIENCE - CHEMISTRY KS3 SCIENCE - CHEMISTRY Pollution

4. 2 2 AIR POLLUTION

5. 3 3 Smoke is made of Particles released during the burning of Fossil Fuels and it causes breathing problems Smoke is made of Particles released during the burning of Fossil Fuels and it causes breathing problems

6. 4 4 AIR POLLUTION Smog is a combination of smoke and fog, where the fog stops the smoke from rising upwards Smog is a combination of smoke and fog, where the fog stops the smoke from rising upwards

7. 5 5 AIR POLLUTION Harmful Carbon Monoxide is given off by vehicle engines Harmful Carbon Monoxide is given off by vehicle engines

8. 6 6 THE GREENHOUSE EFFECT

9. 7 7 CO 2 in the air is used for Photosynthesis by plants, which, like animals, make CO 2 through Respiration CO 2 in the air is used for Photosynthesis by plants, which, like animals, make CO 2 through Respiration CO 2

10. 8 8 THE GREENHOUSE EFFECT Excrement and dead animals and plants are decomposed, and decomposers give off CO 2 too Excrement and dead animals and plants are decomposed, and decomposers give off CO 2 too CO 2

11. 9 9 THE GREENHOUSE EFFECT CO 2 Fossil fuels are formed from dead animals & plants that do not decay quickly Fossil fuels are formed from dead animals & plants that do not decay quickly

12. 10 THE GREENHOUSE EFFECT The burning of fossil fuels by people gives off yet more CO 2 The burning of fossil fuels by people gives off yet more CO 2

13. 11 THE GREENHOUSE EFFECT Radiation from the Sun warms up the Earth Radiation from the Sun warms up the Earth

14. 12 THE GREENHOUSE EFFECT This radiation is reflected away by the Earth This radiation is reflected away by the Earth

15. 13 THE GREENHOUSE EFFECT CO 2 stops some heat from escaping, so Temperature gradually rises CO 2 stops some heat from escaping, so Temperature gradually rises

16. 14 ACID RAIN

17. 15 ACID RAIN Fossil Fuels contain Sulphur, which reacts with Oxygen in the air to form Sulphur Dioxide Fossil Fuels contain Sulphur, which reacts with Oxygen in the air to form Sulphur DioxideOOOOSS + + OOOOSS

18. 16 ACID RAIN This then reacts with water in clouds to form dilute Sulphuric Acid This then reacts with water in clouds to form dilute Sulphuric Acid O O H H H H + + O O H H H H + + H H H H OOOO H H H HOO OO SS + +OOOOSS + + OOOOSS

19. 17 ACID RAIN Acid rain can damage buildings and harm plants Acid rain can damage buildings and harm plants

20. 18 WATER POLLUTION

21. 19 WATER POLLUTION Pollution from factories is sometimes discharged into rivers or the sea Pollution from factories is sometimes discharged into rivers or the sea

22. 20 WATER POLLUTION Sewage needs to be treated to remove the bacteria, but sometimes it is pumped into rivers or the sea Sewage needs to be treated to remove the bacteria, but sometimes it is pumped into rivers or the sea