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Mass Extinctions

Hank takes us on a trip through time to revisit the 5 major mass extinction events that have impacted species over the Earth's history, and leaves us with some thoughts about what could possibly be the sixth event - the one caused by human activities.Like SciShow on Facebook: http://www.facebook.com/scishowFollow SciShow on Twitter: http://www.twitter.com/scishowReferences for this episode can be found in the Google document here: http://bit.ly/KOHsM5extinction, mass extinction, scishow, science, biology, climate change, species, great dying, geological time scale, co2, temperature change, extinction rate, time machine, ordovician-silurian, die-off, glacier, glacial, gondwana, pangea, gamma ray burst, hypernova, ozone layer, extinction pulse, asteroid impact, supervolcano, late devonian extinctions, permian-triassic, dinosaur, cretaceous-tertiary, k-t, human impact
Length: 10:26

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