Biology for IGCSE & O level - Human Influences On Ecosystems (Section 10 - No. 13)
What does the term 'acid rain' refer to?
Rain with a high pH level
Rain that has a pH of less than 7.
Rain that is contaminated with acid-forming pollutants.
Rain that is contaminated with alkaline-forming pollutants.
Explanation
Acid rain is rain containing harmful amounts of acid-forming pollutants.
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