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LIVING PLANET

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ENVIRONMENT, OUR PLANET

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Âge recommandé: 16 ans
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Greece

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LIVING PLANET

ENVIRONMENT, OUR PLANET

Eleni Costopoulou
1

formation billion process changes oxygen support Oxidation tremendous cyanobacteria spacesuits Scientists microbes existence harness precious

Our planet has seen some amazing . Among these changes was the of the world's oldest rock forms around 3 . 95 years ago , as well as the rise of life itself . In order for Earth to life as we know it today , however , a change had to take place in Earth's atmoshere . We all know that we couldn't live on Earth today if there was no . But for the first half of Earth's , the air had almost no oxygen - if humans could travel back to that ancient atmoshere , they'd need to survive . At some point in Earth's past , what scientists call The Great Event took place bringing this gas to Earth's atmoshere .
But what brought about this tremendous change in our atmosphere ? once thought that breathable air was created by , single - celled blue - green that lived in the sea . These bacteria were able to the sun's energy through the of photosynthesis .