Water Pollution

2. typically aquatic plant of a large group that includes the seaweeds and many single-celled forms
5. Huge quantities of rubbish are dumped into rivers and oceans every day. This may be accidental, or it can be a result of poor waste management by local and national authorities.
9. clear liquid
11. is often released into rivers and seas, it contains bacteria that can be harmful, causing skin irritation and diarrhoea in humans.
12. can take a long time to decompose
14. take a very long time to decompose. Bacteria cannot digest these substances, so they are called non-biodegradable
15. living organisms in the water

1. the presence in or introduction into the environment of a substance which has harmful or poisonous effects.
3. contain mineral ions such as nitrate and phosphate. Algae and other producers in the water can then use them to grow rapidly.
4. a large natural stream of water flowing in a channel to the sea
6. rendering something harmful or unusable by the addition of radioactive material
7. generally caused by human beings, which makes it inappropriate or dangerous for consumption
8. is a process in which additional nitrate and other ions in water leads to the death of aquatic organisms
10. The pollution of water by ... does not only affect aquatic organisms. It also affects humans because we rely on water for drinking, washing and irrigating (watering) crops.
13. the expanse of salt water that covers most of the earth's surface