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Card 6
Front
What gas, which is quite abundant now, was most probably limited or non-existent in the earth's early atmosphere?
Back
Card 7
Front
What two planets does the earth's early atmosphere most probably resemble?
Back
Card 8
Front
What happened to the water vapour as the earth cooled down?
Back
Card 9
Front
How many years ago do scientists believe life started?
Back
Card 10
Front
How many years ago do scientists think that algae evolved?
Back
Card 11
Front
How did algae and plants evolving on earth begin to get rid of carbon dioxide in the earth's atmosphere? What did this also do?
Back
Card 12
Front
What is the current percentage of carbon dioxide in the earth's atmosphere?
Back
Card 13
Front
How did the oceans help to reduce the carbon dioxide in the atmosphere?
Back
Card 14
Front
What does carbon dioxide do when it dissolves in water?
Back
Card 15
Front
What do insoluble carbonate compounds do when in water?
Back
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