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14 Cards in this Set
- Front
- Back
A mass extinction is when__%-__% of all species die around the same time. |
50%-90% |
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The Ordovician Extinction happened around _________ years ago. |
443 million |
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The Devonian Extinction happened around _________ years ago. |
359 million |
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The Permian Extinction happened around _________ years ago.
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248 million |
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The Triassic Extinction happened around _________ years ago.
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200 million |
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The Cretaceous Extinction happened around _________ years ago.
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65 million |
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Put these in order: Devonian Cretaceous Ordovician Triassic Permian |
1. Ordovician 2. Devonian 3. Permian 4. Triassic 5.Cretaceous |
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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. |
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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. |
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What was the probable cause of the Devonian Extinction?
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Meteor hit Earth- Widespread dust and debris rain disrupted Earth, causing Extinction more world wide. |
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What was the probable cause of the Permian Extinction?
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-Huge shift in sea level -Asteroid hitting Earth -Flood basalt eruptions -Release of deadly chemicals -Drop in oxygen levels -A mixture of them |
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What was the probable cause of the Triassic Extinction?
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-Flood basalt eruptions -Climate changes -Impact eruptions |
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What was the probable cause of the Cretaceous Extinction?
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Huge asteroid or comet- Struck near the Yucatan Peninsula in Mexico |
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What are the 3 pieces of evidence scientists use? |
1. Principle of Superposition (Observing layers of Earth) 2. Radiometric Dating 3. Fossil Records |