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Card 16
Front
What did the Earth's surface use to be like millions of years ago?
Back
Card 17
Front
What happened when the Earth began to cool down?
Back
Card 18
Front
What was the early atmosphere mostly made up of?
Back
Card 19
Front
Which two planets and moon was the early atmosphere like?
Back
Card 20
Front
When were oceans formed?
Back
Card 21
Front
What evolved over most of the Earth and why?
Back
Card 22
Front
How did the CO2 levels in the atmosphere decrease and oxygen levels increase?
Back
Card 23
Front
How did carbon and hydrocarbons become 'locked up'?
Back
Card 24
Front
What did the carbon and hydrocarbons become in sedimentary rock?
Back
Card 25
Front
What happens when you burn fossil fuels?
Back
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