You are presented with the question "what can power plants cause?" and the following answer choices: 
- Pesticides
 - wind
 - heat energy
 - acid rain
 - friction
 - Pollution
 - coal
 - oil

Now knowing that gases from burning coal and oil dissolving in water in the atmosphere causes acid rain and coal-fired power plants contribute to acid rain, choose the best answer.


 

    acid rain     