history of earth Flashcards
1
Q
main extinction events
A
- Ordovician
- Devonian
- Permian
- Triassic
- K-T
2
Q
ordovician
A
- 85% death rate
- caused by rapid global cooling and drop of sea level
- affected the coastal areas and chemical chemical reactions
3
Q
devonian
A
- 70% death rate
- caused by asteroids and rapid global cooling
- ocean life affected and local destruction from the debris
4
Q
permian
A
- 95% death rate
- caused by volcanic activity, global warming and an increase in Methane and CO2
- the oxygen was removed from the ocean and there was land desertification
5
Q
triassic
A
- 76% death rate
- caused by global warming and an increase in methane and CO2
- desertification of the land and frequent heat waves
6
Q
k-t
A
- 80% death rate
- caused by an asteroid impact, volcanic activity and falling sea levels
- widespread fires, plants disrupted by a global ash cloud and it was a “Nuclear winter”
7
Q
fish
A
- 400 mya
8
Q
amphibia
A
- 300 mya
9
Q
reptiles
A
- 200 mya
10
Q
mammals
A
- 65 mya
11
Q
birds
A
- 150 mya
