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

Fact 2: Acid rain has a pH below 5.6.

Given the two facts above, answer the question "What has a negative impact on water quality?" with the following options: 
- rain
 - harmful substances
 - rain below 5.6 pH
 - sleet
 - fossil fuels
 - Burning fuel and air
 - snow
 - decaying trees


 

   rain below 5.6 pH      