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
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
8. How do you think oil ends up in the water, especially in<br />
oceans?<br />
9. What do all 3categories of pollutants have in common?<br />
Have you noticed that humans <strong>and</strong> their activities are often the<br />
reason why water becomes polluted?<br />
As humans, we often forget that we are sharing this natural<br />
resource with many other organisms. Many of our activities can<br />
change the quality of the water in away that aects the health <strong>and</strong><br />
behaviour of other organisms.<br />
So, as humans, we have a very<br />
important responsibility to<br />
look after our water resources.<br />
5.2 Importance of wetl<strong>and</strong>s<br />
Nature has special methods of cleaning polluted water. In nature,<br />
water is purified in natural environments called wetl<strong>and</strong>s. Wetl<strong>and</strong>s<br />
are very ecient natural 'water treatment' facilities, <strong>and</strong> in this<br />
section we will learn how they work.<br />
Chapter 5. Mixtures <strong>and</strong> water resources<br />
VISIT<br />
BP oil spill in Gulf of<br />
Mexico (video).<br />
goo.gl/OCmEG<br />
NEW WORDS<br />
• wetl<strong>and</strong><br />
• water table<br />
• waterlogged<br />
177
Change language