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Evidence in the fossil record points to (________)major asteroid impacts that have caused mass extinctions in which 50%–96% of life on Earth died out
It is 5.
Points to __5___ major asteroid impacts
Evidence in the fossil record points to five (5) major asteroid impacts that have caused mass extinctions in which 50%–96% of life on Earth died out.
- A mass extinction can be defined as a sudden decrease in the biodiversity of life on Earth.
- The major mass extinction phenomena were caused by catastrophic events such as volcanic eruptions and asteroid impacts.
The five biggest impact craters caused by asteroid collisions include:
- Vredefort Crater
- Chicxulub Crater
- Sudbury Basin
- Popigai Crater
- Manicouagan Reservoir (this last is an ancient eroded asteroid impact crater)
The 5 mass extinction events include:
- The Ordovician-Silurian extinction, which occurred approximately 444 million years (Ma) ago. It has been proposed that this event caused the extinction of around 85% of all life on Earth.
- The late Devonian extinction occurred 383 to 359 million years ago. It has been proposed that this event caused the extinction of approximately 50% of all genera and 19% of all families on Earth.
- The Permian-Triassic mass extinction occurred 252 million years ago. It has been proposed that this event caused the extinction of 57% of all biological families and 83% of all genera on Earth.
- The Triassic-Jurassic extinction occurred 210 million years ago. It has been proposed that this event caused the extinction of 23–34% of marine genera on Earth.
- The Cretaceous-Paleogene extinction is the most recent mass extinction and occurred 65 million years ago. It has been proposed that this event caused the extinction of 75% of all species on Earth.
In conclusion, evidence in the fossil record points to five (5) major asteroid impacts that have caused mass extinctions in which 50%–96% of life on Earth died out.
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