rocks

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  • IG Billions of years before we were alive there was this big explosion that created everything .that explosion was the BIG BANG 
  • then planets started to form and so did earth 
  • then the earth was formed 
  • During the PRECAMBRIAN ERA  all there was in earth was volcanoes 
  • during the PALEOZOIC ERA  plants named CYANOBACTERIA oxygen was starting to form oxigen trough plants (PHOTOSYNTHESIS )the OZONE  was formed in the ATMOSPHERE 
  • We can tell that by rocks by dating the rocks that's how we can estimate the age of the  universe 
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