31
Picture A: Beautiful Kudzu
Picture B: trees disappear under Kudzu vines
Kudzu images courtesy: http://www.alltel.net/~janthony/kudzu/
Experiment:
If you still did not guess the answer, make this little experiment:
Sewage = dried fruits
Decay bacteria = yeast
Oxygen detectors: methylene blue test solution.
0xygen present = methylene turns blue; without oxygen = turns light blue or clear
Mix dried fruits that we place for sewage (organic elements) with yeast (what you use to
make bread rise) in a recipient. Let it stand a little.
Then look for a chemical product called methylene blue test solution, and add it to the solution.
If your solution turns blue, that means there is oxygen in your solution; on the contrary, if the
solution turns light blue or becomes clear, that means there is very little oxygen to none at all in
your solution.
What happened?
_____________________________________________________________________________
How does this relate to the proliferation of plants in water?
______________________________________________________________________________
Water is to be found on the ground, and in the sky. Water coming from the sky can also
be the cause of pollution if combined with other factors.
Erosion and water can play the role of a pollutant.
How?
We will try to help you to find this out:
What is the role of tree roots except from the fact that roots bring nutrients from the ground to the
tree?
_____________________________________________________________________________
32
Therefore, what happens when deforestation occurs and rain falls ?
_____________________________________________________________________________
Have you ever seen a flooded area? What happens to the vegetation, especially when the water is
drawn away?
_____________________________________________________________________________
What causes the erosion of the ground?
You can play hangman to find the solution below:
D_ _ _ _ _ _ _ _ _ _ _ N
Capturing water animals we find in lakes, seas and rivers is a means of survival for many
people in the world. As the world population grows, we need more fish, especially in countries
where it is the main dish.
Can you site some of these countries? Are they some Muslim countries included?
_______________________________________________________________________
Not only people overfish in some areas of the world (about thousand of people eat fish,
not meat, as their primary source of protein), but oil tankers destroy or contaminate their food!
Thousands of spills are reported every year! However, we do need oil!
Why do we need oil?
______________________________________________________________________
Can we find a solution to this problem? Propose yours:
____________________________________________________________________________
____________________________________________________________________________
____________________________________________________________________________
____________________________________________________________________________
____________________________________________________________________________
Water quality:
In 1969, the Cuyahoga river in Ohio, USA, caught fire and burned for several hours
because of the river’s heavy chemical contamination. Now, it is fishable. Modern water and
sewage treatment technologies slowly make a difference.
Create your own Water cycle, and learn to create an ecosystem:
 |
 |
 |
 |