25.4 mass extinction

Question 1

what classifies an extinction as the big five

Answer 1

over 50% of marine species become extinct

Question 2

two biggest mass extinction

Answer 2

permian and

crustaceous

Question 3

permian extinction

Answer 3

between paleozoic and mesozoic

• 96% of marine animal species died
• due to extreme volcanoes in siberia
• the ashes could have increased the carbons dioxide to raise temperatures 6ºC

Question 4

cretaceous extinction

Answer 4

between mesozoic and cenozoic

• killed 50% marine and the dinosaurs
• scientists saw a thin layer of iridium between layers of meso and ceno in rock
• irirdium come from meteorites
• meteorite covered the sun with dust

-chicxulub crater off the yucatan peninsula

Question 5

a 6th mass extinction?

Answer 5

caused by humans

Question 6

mass extinction consequences

Answer 6

lineage disappears forever
-take 5-10 my to return to original diversification
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