More cards in this set

Card 6

Front

Today the Earths atmospherehas much less than 1% carbon dioxide and has more than 21% oxygen this means that?

Back

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Card 7

Front

How does oxygen get added to our atmosphere?

Back

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Card 8

Front

How was carbon dioxide removed from the Earths early atmosphere?

Back

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Card 9

Front

What can add carbon dioxide to the atmosphere?

Back

Preview of the front of card 9