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Mass extinctions - Coggle Diagram

- - - - Reasons: global cooling and a lowering of sea levels. Another interesting theory is that the explosion of a supernova destroyed de ozone layer ending with the lives of many species
- - - - The theories that explain this extinction are: global cooling, reduction of the levels of CO2 due to the forestation and the excessive amounts of algae, an asteroid impact.
- - - - It was the most devastating. The theories that explain this extinction are: Intense volcanism, poisoning of the seas and the atmosphere because of the CH4, the collision of two or more asteroids.
- - - - Causes: Gradual climate changes, scientists do not know if it was a cooling or a warming; an asteroid impact and volcanic eruption.
- - - - The main theory that explains this extinction is the impact of an asteroid in the Yucatan peninsula; resulting in the extinction of dinosaurs.