What process is used to take atmospheric nitrogen and turn it into nitrates?

Nitrogen fixation

Explanation:

Certain soil bacteria, e.g., Azobacter spp can combine free nitrogen of the atmosphere with oxygen to form nitrates. This is called nitrogen fixation. Other nitrogen-fixing bacteria such as Rhizobium form symbiotic unions with the roots of leguminous plants called root nodules. They fix nitrogen to form nitrates which are used up by the host plant. Nitrifying soil bacteria, e.g., Nitrobacter convert nitrites to nitrates in a process called nitrification.

sulfur dioxide

explanation: 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.