Copy of The 5 Mass Extinctions
Published on Nov 18, 2015
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PRESENTATION OUTLINE
1: Ordovician-Silurian mass extinction
During this time period most wild life lived in the sea. so it was sea creatures such as trilobites, Branchiopods, and graptolites that were reduced dramatically. This extinction involved glaciations that turned most of the worlds water into ice, this caused sea levels to drop and of course marine life didn't handle that very well
2: Late Devonian mass extinction
A Drown-out event eliminated about 70% of the marine environment. About three quarters of the current population of all species of animals died out. Life in the shallow seas was worst affected the reefs took a big hit and were not fully restored till about 100 million years ago.
3: Permian mass extinction
NICKNAMED THE GREAT DYING
This extinction was called the great dying because 96% of earths species died out. All of the life on earth today is from the 4% of life that did survive. Many causes have been proposed for the event: asteroid impact, flood basalt eruptions, catastrophic methane release, a drop in oxygen levels, sea level fluctuations or some combination of these.
4: TRIASSIC-JURASSIC EXTINCTION.
About 200 million years ago, massive amounts of lava erupted and created deadly, hot floods. About 20% of all marine families went extinct, as well as creatures similar to mammals, Many large amphibians, and all of the non- dinosaur archosaurs. Actually it is a possibility that a astroid could have caused this extinction but the crater has not been found. Roughly half the species alive at this time became extinct.
5: Cretaceous-Tertiary mass extinction
ALSO KNOWN AS THE K/T EXTINCTION
