Answer:

1.Some examples of natural processes that can contribute to acid rain are sulfur emissions from volcanic eruption, and decaying vegetation. Volcanic eruption is considered as a natural process since volcano is an example of natural resource. ... Decaying vegetation also releases sulfur dioxide that causes acid rain.

2.Acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. These substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain.

3.The ecological effects of acid rain are most clearly seen in aquatic environments, such as streams, lakes, and marshes where it can be harmful to fish and other wildlife. As it flows through the soil, acidic rain water can leach aluminum from soil clay particles and then flow into streams and lakes