1/3 science

1/3 science
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  • You probably think of Earth as what it looks like now and what it has looked like during your lifetime, but Earth and atmosphere were formed
  • (and it was a little different back then)
  • 5 BILLION YEARS AGO.
  • One billion years ago
  • all there was in the atmosphere was carbon dioxide, carbon monoxide, water, nitrogen, and hydrogen.
  • WAY
  • back then I, the
  • back in time
  • (more than 3.5 billion years ago)
  • sun,
  • was still pretty young
  • The hydrosphere was formed from condensation of
  • water vapor
  • 4 billion years ago.
  • Back then there was no
  • O
  • FREE OXYGEN.
  • 2
  • Then, by recombining them,
  • to split water and carbon dioxide molecules.
  • blue-
  • green
  • oxygen
  • algae
  • was made!
  • started using my energy
  • Then, single atoms connected to oxygen atoms.
  • Some of the oxygen atoms that were higher up in the air split, forming single atoms.
  • This formed
  • +
  • =
  • ozone!
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