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Our Vanishing World: Wildlife
Robert J. Burrowes
12-3-19
Throughout its history, Earth has experienced five mass extinction events. See, for example, ‘Timeline Of Mass Extinction Events On Earth’. It is now experiencing the sixth.
- The Ordovician-Silurian Extinction, which occurred about 439 million years ago, wiped out 86% of life on Earth at the time. Most scientists believe that this mass extinction was precipitated by glaciation and falling sea levels (possibly a result of the Appalachian mountain range forming), catastrophically impacting animal life which lived largely in the ocean at the time.
- The Late Devonian Extinction happened about 364 million years ago and destroyed 75% of species on Earth. Possibly spread over hundreds of thousands of years, a sequence of events that depleted the oceans of oxygen and volcanic ash that cooled the Earth’s surface are believed to have driven the extinctions. It was to be.....
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https://www.globalresearch.ca/our-vanishing-world-wildlife/5696513