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  • Earth is believed to be formed about 5 billion years ago. 
  • Over long periods of time Earth separated into layers and its crust cooled.  Earth than settled down but than a meteor the size of mars struck earth. 
  • Molten rock oozed like rivers in some places. All the volcanic activity released heavier gasses creating carbon monoxide and methane. 
  • The hydrosphere was formed 4 billion years ago from water vapor. This created oceans of water where sedimentation occurs. 
  • Algae began using the sun to split molecules of H2o and Co2. This is know as photosynthesis. 
  • There was less greenhouse gases in the world. The earth became much colder. Turning the planet into a giant "Snowball" but volcanoes shot through and melted the ice. 
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