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Card 26

Front

Respiration returns

Back

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Card 27

Front

Interactions between biological and geological processes were critical in allowing an

Back

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Card 28

Front

Burial of organic matter containing sediments also allowed

Back

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Card 29

Front

Human activity has dramatically sped up the of release of carbon from

Back

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Card 30

Front

Nitrogen

Back

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Card 31

Front

Phosphorus

Back

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Card 32

Front

Potassium

Back

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Card 33

Front

Sulphur

Back

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Card 34

Front

Calcium

Back

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Card 35

Front

Magnesium

Back

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