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
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5 Mixtures <strong>and</strong> water resources<br />
NEW WORDS<br />
• pollution<br />
• euent<br />
• sewage<br />
VISIT<br />
Water pollution<br />
(video)<br />
goo.gl/07xDe<br />
174<br />
KEY QUESTIONS<br />
• Why is it important for humans, plants <strong>and</strong> animals to have<br />
access to clean water?<br />
• What is the dierence between clean water <strong>and</strong> polluted<br />
water?<br />
• What are the dierent things that pollute water?<br />
• Why should wetl<strong>and</strong>s be protected?<br />
We have learnt that water can dissolve many substances - water is<br />
a good solvent. When water has unhealthy substances in it, we say<br />
the water is polluted. Polluted water is not clean.<br />
5.1 Water pollution<br />
When is water clean? We could say that clean water is water that is<br />
free of pollutants.<br />
And what are pollutants? Pollutants are substances (or objects)<br />
that do not naturally belong in the water <strong>and</strong> are harmful to us <strong>and</strong><br />
to the environment.<br />
Pollutants may be any of the following:<br />
• Insoluble pollutants: These are things that do not dissolve in<br />
the water but make it dirty, such as oil, garbage <strong>and</strong> toilet<br />
waste (sewage).<br />
• Soluble pollutants: These are chemicals such as soaps <strong>and</strong><br />
fertilisers <strong>and</strong> poisons, such as insecticides <strong>and</strong> acids.<br />
• Living germs (bacteria) that can cause people or animals to<br />
get sick.<br />
In the next activity we will discuss pollution <strong>and</strong> where it comes<br />
from.
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