Major Extinctions Flashcards
The most recent major extinction event was called the….
Creataceous-Tertiary
When did the Cretaceous-Tertiary mass extinction occur?
at the boundary between the Cretaceous and Tertiary periods
How long ago did the Cretaceous-Tertiary mass extinction occur?
65.5 million years ago
During the Cretaceous-Tertiary extinction the ______ were wiped out
dinosaurs
What percent of all species were wiped out by the Cretaceous-Tertiary extinction?
75%
What is the best hypothesis for Cretaceous-Tertiary extinction?
a major meteorite impact in Mexico
The meteorite impact of the Cretaceous-Tertiary extinction can be see as a thin band of ______ all over the world
sedimentation
this meteorite landed with such force the it threw ash into the atmosphere the twas deposited across the globe
the time between the Cretaceous-Tertiary periods is also called the…
kt boundary
the second most recent mass extinction event is called the…
Permian-Triassic extinction
when did the Permian-Triassic extinction occur?
251 million years ago
Which extinction is the largest recorded extinction in Earth’s history?
the Permian-Triassic extinction
The Permian-triassic extinction is also referred to as…
“the Great Dying”
The permian-Triassic extinction killed ____ percent of all marine species and ____ of all land species
96, 70
The Permian-Triassic extinction ended the primacy of…
mammal-like reptiles
What was the most probable cause of the Permian-triassic extinction?
a change in ocean circulation
The Late Devonian period extinction occurred between ____ and ____ million years ago
360,375
Late Devonian period extinction event killed _____ percent of all animal species
70
Why is the Late Devonian period extinction unique?
it lasted for a very long time
How long did the Late Devonian period extinction last?
20 million years
Late Devonian period extinction event may have occurred in _____ of more rapid or severe _____ and then slowing down
pulses, extinction
What is the best hypothesis for Late Devonian period extinction event?
due to the oceans, and thought to be linked to the evolution of trees which caused indirectly some oxygen depletion in the oceans, and without healthy oceans a lot of life on earth dies
what happens to life on earth without healthy oceans?
death
