Major Extinctions

Question 1

The most recent major extinction event was called the….

Answer 1

Creataceous-Tertiary

Question 2

When did the Cretaceous-Tertiary mass extinction occur?

Answer 2

at the boundary between the Cretaceous and Tertiary periods

Question 3

How long ago did the Cretaceous-Tertiary mass extinction occur?

Answer 3

65.5 million years ago

Question 4

During the Cretaceous-Tertiary extinction the ______ were wiped out

Answer 4

dinosaurs

Question 5

What percent of all species were wiped out by the Cretaceous-Tertiary extinction?

Answer 5

75%

Question 6

What is the best hypothesis for Cretaceous-Tertiary extinction?

Answer 6

a major meteorite impact in Mexico

Question 7

The meteorite impact of the Cretaceous-Tertiary extinction can be see as a thin band of ______ all over the world

Answer 7

sedimentation

this meteorite landed with such force the it threw ash into the atmosphere the twas deposited across the globe

Question 8

the time between the Cretaceous-Tertiary periods is also called the…

Answer 8

kt boundary

Question 9

the second most recent mass extinction event is called the…

Answer 9

Permian-Triassic extinction

Question 10

when did the Permian-Triassic extinction occur?

Answer 10

251 million years ago

Question 11

Which extinction is the largest recorded extinction in Earth’s history?

Answer 11

the Permian-Triassic extinction

Question 12

The Permian-triassic extinction is also referred to as…

Answer 12

“the Great Dying”

Question 13

The permian-Triassic extinction killed ____ percent of all marine species and ____ of all land species

Answer 13

96, 70

Question 14

The Permian-Triassic extinction ended the primacy of…

Answer 14

mammal-like reptiles

Question 15

What was the most probable cause of the Permian-triassic extinction?

Answer 15

a change in ocean circulation

Question 16

The Late Devonian period extinction occurred between ____ and ____ million years ago

Answer 16

360,375

Question 17

Late Devonian period extinction event killed _____ percent of all animal species

Answer 17

70

Question 18

Why is the Late Devonian period extinction unique?

Answer 18

it lasted for a very long time

Question 19

How long did the Late Devonian period extinction last?

Answer 19

20 million years

Question 20

Late Devonian period extinction event may have occurred in _____ of more rapid or severe _____ and then slowing down

Answer 20

pulses, extinction

Question 21

What is the best hypothesis for Late Devonian period extinction event?

Answer 21

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

Question 22

what happens to life on earth without healthy oceans?

Answer 22

death