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Earth Formed
Earth Formed- 4.6 billion years ago:
By collisons in the giant disc-shaped cloud of material that also formed the sun. -
Oxygen enters atmosphere
oxygen enters the atmosphere-2.4 billion years ago:
Once iron in the ocean was used up.The irson oxide stopped being deposited and oxygen was able to start building up in the atmosphere. -
1st Eukaryotes
1st Eukaryotes- 2.1 billion years ago:
1st Eukaryotes are descendea from formerly free-living prokaryotic organisms. -
1st form of life
1st form of life- 1 billion years ago:
Processes by which living and fossil organisms have evolved since the 1st form of life. -
Cretaceous Mass Extinction
1st Mass Extinction- 66 million year ago:
Death of the dinosaurs. -
1st multicellular life
1st Multicellular life- 600 million year ago:
Simpler unicellular microbes was a pivotal moment in the history of biology on earth and has arastically reshaped the planets ecology. -
Ordovican Mass Extinction
2nd Mass Extinction- 444 million years ago:
It was sea creatures such as trilobites and brachiopods that were drastically reduced in numbers. -
Devonian Mass Extinction
3rd Mass Extinction- 375 Million years ago:
Life in shallow seas were the worst affected. Reefs were gone and new types of coral evolved. -
Pangaea formed
Pangaea formed- 300 million year ago:
Dry land on earth was joined into one huge land mass. -
Permian Mass Extinction
4th Major Mass Extinction-251 million years ago:
96% of species died out. -
Pangaea begins to break up
Pangaea begins to break up- 270 million year ago: Was a supercontinent that existed during the late paleozoic and early mesozok era. -
Triassic Mass Extinction
5th Major Mass Extinction-200 Million years ago:
Climate changes, flood eruption and asteroid. -
1st Homo Sapiens
1st Homo sapiens-200,000 years ago:
Did not come after the neandertais but were their contemporaries.
