Acid rain: toxic metals.
D001673:Biodegradation, Environmental; D004463:Ecology; D004787:Environmental Pollution / Q000009:adverse effects*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D009566:Nitrates / Q000009:adverse effects; D017942:Nitric Acid; D011891:Rain; D013464:Sulfuric Acids / Q000009:adverse effects*; D014887:Weather
D009566:Nitrates; D013464:Sulfuric Acids; D017942:Nitric Acid