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14 Cards in this Set

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  • Back

A mass extinction is when__%-__% of all species die around the same time.

50%-90%

The Ordovician Extinction happened around _________ years ago.

443 million

The Devonian Extinction happened around _________ years ago.

359 million

The Permian Extinction happened around _________ years ago.

248 million

The Triassic Extinction happened around _________ years ago.

200 million

The Cretaceous Extinction happened around _________ years ago.

65 million

Put these in order:


Devonian


Cretaceous


Ordovician


Triassic


Permian

1. Ordovician


2. Devonian


3. Permian


4. Triassic


5.Cretaceous



Is 100% of all species killed in an extinction possible?

Yes, but that would mean that all life on Earth is ended, and that has never happened before. If it did, then we would not be alive.

What was the probable cause of the Ordovician Extinction?

Climate Change-


Earth went through an ice age; it wiped out many species because they were not ready.

What was the probable cause of the Devonian Extinction?

Meteor hit Earth-


Widespread dust and debris rain disrupted Earth, causing Extinction more world wide.

What was the probable cause of the Permian Extinction?

-Huge shift in sea level


-Asteroid hitting Earth


-Flood basalt eruptions


-Release of deadly chemicals


-Drop in oxygen levels


-A mixture of them

What was the probable cause of the Triassic Extinction?

-Flood basalt eruptions


-Climate changes


-Impact eruptions

What was the probable cause of the Cretaceous Extinction?

Huge asteroid or comet-


Struck near the Yucatan Peninsula in Mexico

What are the 3 pieces of evidence scientists use?

1. Principle of Superposition (Observing layers of Earth)


2. Radiometric Dating


3. Fossil Records