DE earth history

• During the Hadrian (1) eon the moon formed, Iron sank to form the core, meteorites regularly collided with the Earth and green house gases in the atmosphere were high (no oxygen)
• During the Archean (2) the ocean finished forming, the continents formed due to cooling of the crust, plate tectonics began and the first forms of life (Cyanobacteria) formed oxygenating the ocean then atmosphere
• During the Paleo-Protozoic (3) the great oxygenation event occurred leading to the development of multicellular life
• During the Neo-Proterozoic (4), Rodinia began breaking apart releasing CO2 into the atmosphere leading to a Snowball Earth (glaciation of the planet)
• During the Cambrian (6), the Cambrian explosion of life occurred, with the emergence of complex life forms
• During the Ordovician (7), a mass extinction event occurred due to an Ice age, wiping out 85% of life, Ordovician radiation the diversification of life also occurred
• During the Cretaceous period, the Cretaceous Palaeocene extinction caused by an asteroid wiped out 75% of life (death of the dinosaurs)
• During the end of the Permian (11), volcanism saw an increase in CO2 in the atmosphere, leading to a mass extinction event that killed 95% of life
• the rise of mammals occurred after the Cretaceous Palaeocene extinction, in the Palaeocene