2 Origins of Water 8

2 Origins of Water 8 - in water: insoluble In the absence...

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Stromatolites Colonies of Cyanobacteria The oldest macroscopic evidence of life on Earth, at least 2.5 billion years old Produced billions of tons of oxygen Calcium Carbonate Cyanobacteria colonies turfs
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The First Organisms Oldest macroscopic life: stromatolites Cyanobacteria colonies sediments Effect? Produced billions of tons of O 2 Immediate increase in atmospheric O 2 ?
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Ammonium Carbon Dioxide Hydrogen Helium Water Vapor Oxygen = 0.42% Oxygen Alteration of the Earth’s Atmosphere Decreased carbon dioxide Photosynthesis Increased atmospheric oxygen?
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Iron Iron oxide Does not dissolve
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Unformatted text preview: in water: insoluble In the absence of oxygen, iron is easily dissolved in water CO 2 + H 2 O C 6 H 12 O 6 + O 2 Approximately 1.8 2.5 bya 4 Fe + 3O 2 2Fe 2 O 3 When oxygen is present it quickly combines with iron to form compounds that are not easily dissolved in water. Dissolved iron + oxygen = solid iron Photosynthesis produces oxygen sinks CO 2 + H 2 O C 6 H 12 O 6 + O 2 Banded Iron Formations 4 Fe + 3O 2 2Fe O Dissolved in oceans solid Contain 20 times the oxygen of the atmosphere. photosynthesis...
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2 Origins of Water 8 - in water: insoluble In the absence...

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