Science Quiz / Periods of Earth's History

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Score 0/19 Timer 10:00
Time PeriodPeriodMajor Developments
4550-3800 myaOldest known rocks, oceans form, evidence of life
2500-543 myaSoft-bodied animals, oxygen levels reach 3%, breakup of Laurentia supercontinent
5.3-1.8 myaFirst hominids, first global ice ages
65-54 myaFirst primates, rodents, and bats
417-354 myaFirst amphibians and seed plants, oxygen reaches present-day levels
3800-2500 myaPhotosynthetizing bacteria, first eukaryotes, continents begin shifting
543-490 mya'Explosion' of life, first chordates, first arthropods, Gondwana supercontinent forms
33-24 myaFirst apes, formation of grasslands
206-144 myaBreakup of Pangaea, first birds
248-206 myaFirst mammals, crocodiles, and dinosaurs
Time PeriodPeriodMajor Developments
1.8-0.01 myaEarly cave-dwelling humans, periods of glaciation
290-248 myaFormation of Pangaea, conifers, mammal-like reptiles
54-33 myaFirst whales, continents near present-day positions
354-290 myaSwamps, tree ferns, first reptiles
0.01-0 myaPresent day
443-417 myaVascular land plants, terrestrial arthropods
144-65 myaFirst flowering plants and pollinating insects
490-443 myaAppearance of land plants, sharks, and fishes
24-5.3 myaGreat mountain building, horses, kelp forests, chimpanzees

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