Q: What causes acid rain, ozone depletion, and global warming?


Read this paragraph and choose the correct option from the provided answers:

Air pollution consists of chemical substances and particles released into the air, mainly by human actions. The major cause of outdoor air pollution is the burning of fossil fuels. Indoor air can also be polluted. Air pollution, in turn, causes acid rain, ozone depletion, and global warming.

 Choices:

- ozone layer

- water pollution

- radiation

- air pollution


A:
air pollution