More cards in this set

Card 6

Front

What happened as the Earth cooled?

Back

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Card 7

Front

What happened in the next two billion years?

Back

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Card 8

Front

How did algae and plants change the Earth's atmosphere?

Back

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Card 9

Front

Where did most of the carbon dioxide, nitrogen and water vapour in the Earth's early atmosphere come from?

Back

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Card 10

Front

What produced the oxygen in the atmosphere?

Back

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Card 11

Front

**TRY TO MEMORISE THE MAIN GASES THAT WERE PROBABLY IN THE EARTH'S EARLY ATMOSPHERE**

Back

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