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Mass Extinctions - Coggle Diagram
Mass Extinctions
Ordovician:
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Its cause of extinction was the global cooling, it lowered the sea level in a 80%
Devonian:
Devonian was called the earth of the fish thanks to its multiple fishe species, it also was 416 / 359 years ago.
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Some theories that explain the extinction of these marine creatures are the low levels of carbon dioxide thanks to the deforestation or global cooling.
Creataceous
During this period the porcentage of Dinosaurs was more than mammals, it was 146 / 66 million years ago and part of our actual flora was formated
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Their extinction occurs thanks of an asteroid that impact the earth, making dinosaurs desappear. (Based on the existance of a geological layer that contained Iridium)
Permian
Reptiles, Amphibians and fishes were an abundant specie when pangea got formed (299 / 251 million years ago)
Some possible theory´s of their extinction are volcanic activity, sea poisoning and the impact of an asteroid
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Triassic
Dinosaurs apperead to breack up Pangea area, all this happened 251 / 199 years ago
There isn´t any completely proved reason of why they got extinct but some theory´s are volcanic eruptions, climate change and global cooling. Their extinction affected the sea
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