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21 LO3: SCIENCE, SOCIETY AND THE ENVIRONMENT The learner will be able to demonstrate an understanding of the interrelationships between science and technology, society and the environment. Clean drinking water in the town Lots of people live in a town. It is important that there is enough clean water for everyone. For you to do: Follow the path of a water droplet to see how water is cleaned to make it safe to drink. Questions to talk about: 1. Water is used in many different ways in the city. Name six uses of water in the city. 2. Water is scarce in many parts of South Africa. It is a valuable resource that needs to be used wisely. List three ways in which you can use water wisely. 3. What would happen to a town if the people did not pay for their tap water? Intermediate Phase: Natural Sciences Smelly Science 21 MANZI PAY FOR WATER I pass through screens to remove large plants, animals, sticks and litter. 2 I am in a giant giant tank where I spin around and around. Some chemicals have been added. Sand, plants, animals and some germs stick to the chemicals to form floc. 3 I am in a large tank. The floc sinks to the bottom of the tank. I am cleaner already, but not clean enough to drink. 4 Almost clean! Now I am flowing through a sand filter to remove the last small plants, animals and some germs. 5 I am being sprayed with chlorine gas to kill all remaining germs. I am clean enough to drink! 6 I have travelled along many rivers to reach the dam. Along the way, I have picked up many things that make me dirty. I am on my way to the purification station to be cleaned. 1 ANDWATER CHANGES.indd 21 10/9/08 10:20:09
