UNESCO resource kit - science and technology educa...
UNESCO resource kit - science and technology educa...
UNESCO resource kit - science and technology educa...
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
<strong>UNESCO</strong> Nodule 10: Tropical rain forests<br />
Tropical rain forests <strong>and</strong> the Earth's atmosphere<br />
Tropical rain forests have an important effect on the amount of carbon dioxide in<br />
the Earth's atmosphere. This means that chopping them down also has an effect<br />
on the amount of carbon dioxide in the atmosphere. The diagram shows why.<br />
9 What do growing trees do with carbon dioxide from the atmosphere?<br />
10 What effect will chopping down tropical rain forests have on the amount<br />
of carbon dioxide in the Earth's atmosphere? Mention three reasons for this<br />
effect.<br />
Carbon dioxide in the atmosphere has a similar effect as the glass in a greenhouse.<br />
You can observe this effect for yourself using the apparatus shown below.<br />
sunlight<br />
(orlight from a bright lamp)<br />
thennomelers<br />
I<br />
glass bottle<br />
glass<br />
Lightraysfrom sun<br />
pass through glass.<br />
Energywanns up<br />
inside of bottle.<br />
Infra red rays<br />
from inside bottle<br />
absorbed byglass.<br />
Someenergysent<br />
back into bottle.<br />
11 What happens to the temperature inside the glass bottle compared to the<br />
temperature outside the bottle? Why does this happen?<br />
12 What is likely to happen to the Earth if the amount of carbon dioxide in<br />
the atmosphere keeps on increasing?<br />
13 Why is the effect of the carbon dioxide in the Earth's atmosphere called<br />
the Igreenhouse effect'?<br />
Page 3
Change language