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Card 6
Front
What was limestone formed from?
Back
Card 7
Front
What do fossil fuels contain?
Back
Card 8
Front
Apart from plants, how else was carbon dioxide removed from the atmosphere?
Back
Card 9
Front
What may have happened to some of the carbon dioxide dissolved in the oceans?
Back
Card 10
Front
What happened to the atmosphere 200 million years ago?
Back
Card 11
Front
Apart from nitrogen and oxygen, what other gases are there in the atmosphere?
Back
Card 12
Front
How can fractional distillation be used to separate the gases in the air?
Back
Card 13
Front
In what ways did carbon dioxide become 'locked up'?
Back
Card 14
Front
What are the approximate percentages of nitrogen and oxygen in the air?
Back
Card 15
Front
Why can the gases air be separated by fractional distillation?
Back
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