Water Pollution

1234567
Across
  1. 4. algae _____ prevents sunlight from entering the water
  2. 5. animals and plants cannot grow well in ____ water.
  3. 6. oil spills are often caused by ____ between ships and oil tankers.
  4. 7. oil spills may cause aquatic animals and plants to die due to lack of ____.
Down
  1. 1. ___ are enforced to make sure factories treat their waste before discharging into waterways.
  2. 2. fertilisers and pesticides are highly soluble so rain can easily wash them into the rivers and lakes as ______.
  3. 3. litter can cause health problems to aquatic animals that ___ them.
  4. 4. untreated sewage from homes can contain harmful ______.