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Mass Extintion, Link Title, Link Title - Coggle Diagram
Mass Extintion
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Permian
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Their extintion may was cased because of intense volcanism, poisoning sea and the atmosphere, or possibly a collision with one or more asteroids.
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Devonian:
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The theories that are most likely to explain their mass extintion are: global cooling, reduccion of the levels of carbon dioxide due to forestation of the continets and possibly an asteroid impact.
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Triassic
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Different reasons has been proposed for this mass extintion and this are the reasons: gradual climate changes, an asteroid impact, volcaic eruptions or global cooling.
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Cretaceous:
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This mass extintion is atributed to the impact of an asteroid based on the excistence of geological layer with strong precence of iridium.
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What is mass extintion?
A mass extinction is usually defined as a loss of about three quarters of all species in existence across the entire Earth over a “short” geological period of time.
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