Section: World Geography

8) In Eastern Canada, damage has been caused to trees, plants, fish, and buildings by pollutants from factories.  This type of pollution is called: 

1. acid rain
2. greenhouse effect
3. mercury poisoning
4. ozone layer

Acid rain is a rain or any other form of precipitation that is unusually acidic, meaning that it possesses elevated levels of hydrogen ions (low pH). It can have harmful effects on plants, aquatic animals and infrastructure.