_______ occurs when acid rain adds hygrogen ions to the soil which interact chemically with existing minerals.
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Solution
Leaching:
Leaching is the mechanism by which these crucial nutrients are replaced after acid deposition adds hydrogen ions.
Leaching refers to the ions being washed out of the top soil or deeper into the subsoil. Ions are no longer accessible to plant roots if they are leached from the soil.
Conclusion: Leachingoccurs when acid rain adds hygrogen ions to the soil which interact chemically with existing minerals.