Answer the following question given this paragraph: 

Acid rain is rain that has a pH less than 5 (see Figure below ). The pH of normal rain is 5.6. It’s slightly acidic because carbon dioxide in the air dissolves in rain. This forms carbonic acid, a weak acid.


Q: What is the term for rain that has a ph less than 5, due to carbon dioxide dissolving?

 Choices:

- frozen rain

- basic rain

- carbon rain

- acid rain

A:
acid rain
