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Card 26

Front

What does the ozone layer do?

Back

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Card 27

Front

According to the primordial soup theory, what was the early atmosphere made up of?

Back

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Card 28

Front

What happened to result in the formation of amino acids?

Back

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Card 29

Front

What is a 'primordial soup'?

Back

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Card 30

Front

What happened when these amino acids gradually combined?

Back

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Card 31

Front

Who carried out an experiment in the 1950s to test the primordial soup theory?

Back

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Card 32

Front

What was the conclusion about this theory?

Back

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Card 33

Front

Over the next six cards, describe the process of fractionally distilling air

Back

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Card 34

Front

Step two

Back

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Card 35

Front

Step three

Back

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