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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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