The cause and impacts of the five mass extinction events in Earth's history, and predictions for a sixth which could end human life.
- Is Earth experiencing its six mass extinction, as a result of man's activities?
- On five previous occasions, catastrophic change has killed entire populations, like the dinosaurs.
- Natural factors influenced these massive population changes.
- Rising sea levels, global warming and a meteorite have all been suggested as reasons behind the extinction of dinosaurs.
There have been five major extinctions in Earth's history, dating back hundreds of millions of years.
The first was the Ordovician-Silurian extinction, 439 million years ago, caused by rapid changes in sea level.
439 million years ago
Next was the Late Devonian extinction 364 million years ago.
Scientists are unsure ...
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