The Sulfur Cycle ·
Volcanoes to Rain
un
seel
.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
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.com · The Sulfur Cycle