Discussion
What is the primary cause of acid rain?
Answer: B
The primary cause of acid rain is sulfur dioxide and nitrogen oxides.
Sulfur dioxide from burning coal and oil, and nitrogen oxides from vehicles and power plants, react with water and oxygen in the atmosphere to form sulfuric and nitric acids, which fall as acid rain.
Carbon dioxide makes rain only slightly acidic (pH about 5.6), which is normal; methane and ozone are not the cause of acid rain.
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