Which is NOT caused by acid rain?

The correct answer is: Spread of disease

Acid rain is rain or any other form of precipitation that is unusually acidic, meaning that it has elevated levels of hydrogen ions (low pH). Most water, including drinking water, has a neutral pH that exists between 6.5 and 8.5, but acid rain has a pH level lower than this and ranges from 4–5 on average.
Acid rain damages statues, due to lowering of water pH fishes die, and trees weakened.