Answering Exams

Acid rain is mainly caused by emissions of __________ in the atmosphere?

Acid is mainly caused by emissions of __________ in the atmosphere?
    1. Sulfur Dioxide and Potassium Nitrate
    2. Sulfur and Charcoal
    3. Nitrogen Oxide and Potassium Nitrate
    4. Sulfur Dioxide and Nitrogen Oxide(correct)
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