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Card 6

Front

What happened when the oceans formed CO2?

Back

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Card 7

Front

What does this then cause? (Question 6)

Back

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Card 8

Front

How else is CO2 decreased?

Back

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Card 9

Front

What did Algae and Plants decrease?

Back

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Card 10

Front

What have algae and plants produced?

Back

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Card 11

Front

When did algae first produce oxygen?

Back

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Card 12

Front

What is the photosynthesis equation?

Back

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Card 13

Front

How do greenhouse gases help?

Back

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Card 14

Front

Give an example of greenhouse gases.

Back

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Card 15

Front

What greenhouse gases increase in amount due to human activities?

Back

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