Natural Sciences and Technology Grade 6-A - Thunderbolt Kids
Natural Sciences and Technology Grade 6-A - Thunderbolt Kids Natural Sciences and Technology Grade 6-A - Thunderbolt Kids
5 Mixtures and water resources NEW WORDS • pollution • euent • sewage VISIT Water pollution (video) goo.gl/07xDe 174 KEY QUESTIONS • Why is it important for humans, plants and animals to have access to clean water? • What is the dierence between clean water and polluted water? • What are the dierent things that pollute water? • Why should wetlands be protected? We have learnt that water can dissolve many substances - water is a good solvent. When water has unhealthy substances in it, we say the water is polluted. Polluted water is not clean. 5.1 Water pollution When is water clean? We could say that clean water is water that is free of pollutants. And what are pollutants? Pollutants are substances (or objects) that do not naturally belong in the water and are harmful to us and to the environment. Pollutants may be any of the following: • Insoluble pollutants: These are things that do not dissolve in the water but make it dirty, such as oil, garbage and toilet waste (sewage). • Soluble pollutants: These are chemicals such as soaps and fertilisers and poisons, such as insecticides and acids. • Living germs (bacteria) that can cause people or animals to get sick. In the next activity we will discuss pollution and where it comes from.
ACTIVITY: Thinking about pollution INSTRUCTIONS: 1. We are going to discuss pollution. 2. The following pictures of dierent polluted water sources, and the questions that follow, are meant to guide the discussion. Pollution in apond. A polluted river. Pollution on the coast. People have been using this stream to dump rubbish. An oil spill. Chapter 5. Mixtures and water resources 175
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ACTIVITY: Thinking about pollution<br />
INSTRUCTIONS:<br />
1. We are going to discuss pollution.<br />
2. The following pictures of dierent polluted water sources, <strong>and</strong><br />
the questions that follow, are meant to guide the discussion.<br />
Pollution in apond. A polluted river.<br />
Pollution on the coast. People have been using this stream<br />
to dump rubbish.<br />
An oil spill.<br />
Chapter 5. Mixtures <strong>and</strong> water resources<br />
175
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