Thursday, February 8, 2018

A New Era

What major changes do scientist use to divide up geological time? 

Geological Time Brain Pop



15 comments:

  1. They use major extinctions are massive changes and diversity of life. For example the Cambrian explosion which signaled the end of the Precambrian.

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  2. Scientist use major extinctions.

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  3. Scientists use major extinctions

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  4. They use major extinctions.

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  5. Scientists use major extinctions

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  6. The scientists use major extinctions

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  7. They use major extinctions and major changes to the Earth.

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  8. Major extinctions and major geographigal changes

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  9. Major extinctions.

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  10. Scientist use types of fossils and the age of rocks.

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