6. EUTROPHICATION
If too much fertiliser is used
it runs off into streams and
rivers.
The fertiliser makes river
plants and algae grow really
fast
7. The stream cannot support so
much plant life, so the plants
start to die.
As the plants die, they are
rotted by bacteria which use up
all the OXYGEN in the stream
8. Lack of oxygen causes the
fish and other animals in the
stream to die.