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Geologic Time Scale Scramble

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Geologic Time Scale Scramble

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About this activity

Unscramble key terms about Earth's deep history.

Created by

Robert Abril
Robert Abril
Philippines

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Geologic Time Scale Scramble
 

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Geologic Time Scale ScrambleOnline version

Unscramble key terms about Earth's deep history.

by Robert Abril
1

A timeline that divides Earth’s history into hierarchical units, revealing the sequence of major events.

     
  
  
2

Remains or traces of ancient organisms preserved in rocks, offering clues about past life.

3

Markers that help assign relative ages to rock layers by being common in many places and existing for a limited time.

  
  
4

A method to order events based on rock layers and features, without exact numeric ages.

  
  
5

A technique that assigns numeric ages to rocks by measuring decay rates and other time clues.

  
  
6

Principles describing how deposition creates a vertical sequence, with older rocks at the bottom.

  
  
7

A rapid, worldwide loss of many species that reshapes life on Earth.

  
  
8

A natural process allowing age estimation through decay rates of unstable nuclei.

 
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