major events in earth quiz

formation of the Earth (4500 - 4000bya)

formation of the core and crust (4000 - 4000bya)

beginning of invertebrates 550-500 mya

beginning of vertebrates 500 - 450 mya

start of unicellular organism, cyanobacterias, and formation of ozone layer (2500 - 550 mya)

diversification of plants 450 - 400 mya

start of amphibians 400 - 350 mya

beginning of trees and reptiles 350 - 33 mya

formation of pangaea, mass extinction, "siberian traps" massive volcanic eruptions 300 - 250 mya

pangaea breaks into laurasia (west), gondwana (south), dinosaurs