The Sulfur Cycle · Volcanoes to Rain
unseel.com · S → SO₂ → SO₄²⁻ → H₂S · a redox traffic
Oxidation −2 to +6
Acid rain pH ≈ 4.2
phase
SO₂ (+4)
SO₄²⁻ (+6)
DMS · H₂S (−2)
H₂SO₄ rain
pyrite FeS₂
Unseel.com · The Sulfur Cycle