The point the author is making is that one type of pollution can lead to other types of pollution.
This shows how substances that pollute the air can combine with other substances that fall to the earth as precipitation, which can pollute soil and water.
What is Acid rain?
Acid rain is rain or any other form of precipitation that is unusually acidic, meaning that it has elevated levels of hydrogen ions. Most water, including drinking water, has a neutral pH that exists between 6.5-8.5, but acid rain has a pH level lower than this and ranges from 4-5 on average
For more information about Acid rain, refer to the link:-
brainly.com/question/3761662
