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Slide Notes

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Copy of Earth History

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PRESENTATION OUTLINE

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Earth is Born

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  • 4.5 billion years ago
  • Formed from cloud of dust and rock
  • Rocks collided then formed gravity over time.
  • Planet collides with Earth chunks form moon.
  • Cooled, solidified, allowing water to exist on surface [1]

The Great Oxidation

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  • Bacteria harnessed sunlight.
  • Carbon dioxide + water = sugar. [2]
  • Oxygen may have caused 1st "Snowball Earth".
  • Oxygen stripped green house gases.
  • 2.3 billion years ago. [3]

The First Birds

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  • Birds evolved from feathered dinosaurs.
  • Archaeopteryx, famous early bird.
  • Archaeopteryx is 150 million years old
  • Xiaotingia and Aurormis found in China.
  • Started 160 million years ago.
  • Came from theropod dinosaurs [4]