What is acid rain? How is it formed? Mention three bad effects of acid rain?

Can someone asnwer this question for me? I only that their pH is around 4.5 and if goes a li'l bit more also it can cause a lot of harm.

some chemicals like carbon dioxide , sulphur dioxide and nitrogen dioxide are released into the air as pollutants. these dissolve in rain drops to form carbonic acid, sulphuric acid and nitric acid . acid rain can cause damage to monuments, buildings, plants animals etc.