L15 water pollution
-
Upload
maruja-ruiz -
Category
Technology
-
view
1.082 -
download
0
Transcript of L15 water pollution
Water PollutionWater Pollution
Water can be polluted by •SEWAGE•FERTILISERS•PESTICIDES/HERBICIDES•TOXIC SUBSTANCES
Water Pollution
Sewage
Sewage is human waste. Without careful processing it can cause pollution and disease.
Fertilisers
•CONTAMINATE drinking water
•EUTROPHICATION
EUTROPHICATION
If too much fertiliser is used it runs off into streams and rivers.
The fertiliser makes river plants and algae grow really fast
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
Lack of oxygen causes the fish and other animals in the stream to die.
PESTICIDES and HERBICIDES can be washed into rivers and streams
This kills plant and animal life
Toxic Chemicals
•Toxic chemicals can build up in food chains causing birth defects and reproductive problems.
The Minimata Bay Tragedy