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Card 6

Front

how did oxygen become part of the earths atmosphere

Back

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Card 7

Front

what happens when the plants evolved

Back

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Card 8

Front

what did the first forms of animals rely on

Back

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Card 9

Front

why did some of the first living microorganisms die

Back

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Card 10

Front

what is the equation of photosynthesis

Back

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Card 11

Front

what is coal classed as

Back

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Card 12

Front

how was crude oil and natural gases formed

Back

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Card 13

Front

what does photosynthesis do

Back

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Card 14

Front

what do fossil fuels and formation of sedimentary rocks do

Back

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Card 15

Front

what did methane and ammonia react with in the early atmosphere

Back

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