Acid rain has a negative impact on water quality.
Acid rain has a ph below 5.6.
Rain with a ph below 5.6 has a negative impact on water quality.
What has a negative impact on water quality?

a) rain
b) harmful substances
c) rain below 5.6 pH
d) sleet
e) fossil fuels
f) Burning fuel and air
g) snow
h) decaying trees