Water pollution

2. Water pollution type when it is only on the upper layer
3. One of the most clearest water source in Latvia
5. What you can`t throw idown the drain
6. The most toxic heavy metal
7. You need to...if you think the water is a little bit unclean
10. Disease that is caused by bacteria that is spread through water contaminated by faeces from an infected person.
11. Substance which pollutes see, oceans, rivers(often from ships)
13. rain Substance which has a pH of below 6.5
15. One of 4 water pollution treatments
17. The worst result from illnesses from water pollution

1. Substance, birds stick round when they fly to the polluted water source
4. Process by which a body of water acquires a high concentration of nutrients, especially phosphates and nitrates.
6. Malaria is caused by a parasite that is transmitted by some species of female…
7. One of the organ where live Bilharzia`s parasite
8. How is called algae in Baltic sea?
9. The substances that use agriculturists. It is very dangerous for water sources
12. The last parasite phase in illness Bilharzia
14. Place where is the most pulluted river in the world
16. Which population has the worst situation in water polution?