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Card 6
Front
What two gases are in today's atmosphere ?
Back
Card 7
Front
What percentage of nitrogen is in today's atmosphere ?
Back
Card 8
Front
What percentage of oxygen is in today's atmosphere ?
Back
Card 9
Front
What is the other 1 percent in today's atmosphere ?
Back
Card 10
Front
What is the evidence for there being gases billions of years ago ?
Back
Card 11
Front
What was the earth's temperature to start with ?
Back
Card 12
Front
What happened to the planet over time ?
Back
Card 13
Front
step 1 - what did carbon dioxide do in the oceans ?
Back
Card 14
Front
step 2 - what did the marine organisms use the dissolved carbon for ?
Back
Card 15
Front
step 3 - The shells of dead marine organisms fell to the sea bed and become part of what ?
Back
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