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The teacher
tells the children:
There
are some beings called microscopic organisms that live in the seas.
These organisms are the food for other animals like fish, crabs, lobsters,
cockles, mussels, sea horses and many others. We eat all these animals.
The seas and oceans are full of plants, mineral salts and vitamins
that are very healthy for human beings.
If we don't care for the seas and their water and if we throw garbage
into them , the water gets dirty and poisoned and then the animals
and plants that live there get ill and sometimes they even die. We
can also get ill if we eat some of these poisoned aliments.
Today we are going to carry out an experiment to see how the sea and
its plants and animals can be contaminated.
The children
will prepare two buckets; they will fill them up with water. In one
of them they will drop some watercolour (or something similar).
The teacher
will print the supplementary material (click
to open in a new window) on
white paper (if possible use a non-glossy, quite porous paper) and will
give a copy to each child. The children will cut up the fishes.
They will
put up one of the fiches in the bucket with coloured water and the other
one in the clean water bucket.
After a short
time, each child will fish out a fish from each one of the buckets.
Then they will have to compare the two fishes. What has happened?
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