3 Water and Life 5

3 Water and Life 5 - In the absence of oxygen, iron is...

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In the absence of oxygen, iron is easily dissolved in water In the absence of oxygen, iron is easily dissolved in water
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CO 2 + H 2 O C 6 H 12 O 6 + O 2 Between 1.8 – 2.5 bya 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
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CO 2 + H 2 O C H O + O 2 Banded Iron Formations Iron + O 2 Fe O Dissolved in oceans solid Deposits contain 20 times the oxygen of the atmosphere. photosynthesis The source of all iron that is mined today End ~1.8 bya
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Emergence of more complex cells Multicellular Organisms Increased complexity/diversity of organisms Oxygen in the Atmosphere/Oceans all modern phyla of animals develop first vertebrates emerge fishes diversify
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3 Water and Life 5 - In the absence of oxygen, iron is...

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