Fact 1: Acid rain has a negative impact on water quality.

Fact 2: Sulfur dioxide causes acid rain.

Given the two facts above, answer the question "Water quality can be negatively effected by what? " with the following options: 
- flooding
 - Pesticides
 - erosion
 - contamination
 - competition
 - Pollution
 - sulfur dioxide
 - deforestation


 

       sulfur dioxide  