100021
Earth
- Phase 1: many million years ago..
- 1) molten - so hot atmosphere
boiled away..
- 2)eventually cooled to form thin crust
- 3)volcanoes erupted:
gave of Co2 and
water vapour. Mostly Co2 no oxygen
- 4)Water vapour condensed to create oceans
- 1) molten - so hot atmosphere
boiled away..
- Phase 2
- 1)Co2 dissolved in oceans
- 2)marine organism developed
- took in CO2 - buried under layer of
sediment - locked in carbonate rock
- Green plants evolved - took co2 ,
produce O2 by photosnythesis
- 1)Co2 dissolved in oceans
- Phase 3:
- build up o2 killed off early organism
- Oxygen created ozone layer, blocked harmful rays.
- more complex org. could flourish
- more complex org. could flourish
- build up o2 killed off early organism
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