Module 5.2 – Biogeochemical Cycles

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Last updated 5:38 PM on 6/23/26
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22 Terms

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Carbon in Atmosphere
CO₂
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Carbon in Organisms
Organic carbon (C₆H₁₂O₆)
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Carbon in Ocean
CO₂, H₂CO₃, HCO₃⁻
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Carbon in Sedimentary Rock
CaCO₃
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Photosynthesis
CO₂ → C₆H₁₂O₆
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Cellular Respiration
C₆H₁₂O₆ → CO₂
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Combustion
Organic carbon → CO₂ or CO
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Nitrogen in Atmosphere
N₂
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Nitrogen in Soil
NH₄⁺ and NO₃⁻
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Nitrogen in Organisms
Organic nitrogen
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Nitrogen Fixation
N₂ → NH₄⁺ or NO₃⁻
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Assimilation
NH₄⁺ or NO₃⁻ → Organic nitrogen
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Ammonification
Organic nitrogen → NH₄⁺
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Nitrification
NH₄⁺ → NO₃⁻
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Denitrification
NO₃⁻ → N₂
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Phosphorus in Soil and Water
PO₄³⁻
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Largest Reservoir of Phosphorus
Rocks and sediments
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Weathering and Erosion
Releases phosphate from rocks
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Dissolved Phosphates
Phosphate dissolved in water
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Phosphate Rock
Long-term phosphorus storage
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Fertilizer Runoff
Phosphorus movement from land to water
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Phosphorus Cycle Key Fact
No atmospheric phase