The K-Pg extinction Flashcards
1
Q
why is the end Cretaceous extinction important
A
Because it is one of the 5 largest in the history of life
2
Q
who died by the end Cretaceous Extinction
A
- non avian dinosaurs
- pterosaurs
- marine reptiles
- ammonites
- rudist bivalves
3
Q
Who survived the end Cretaceous Extinction
A
- avian dinosaurs
- crocodiles
- mammals
- amphibians
- fish
4
Q
What are the causes of the end Cretaceous extinction
A
- Meteorite or asteroid causing climate change
-massive volcanic eruptions causing atmospheric disruptions
-global marine regression causing harsher, seasonal climates
5
Q
What is the evidence supporting meteorites or asteroids
A
-Iridium layer found all over the world, it is very rare on earth but abundant in meteorites
6
Q
If there was a meteorite what were the effects of it
A
- blocking the sun
-heat of impact caused wild fires - stopped photosynthesis
- months of global cooling
-acid rain - delayed greenhouse warming
