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Geologic Time Crossword Puzzle

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Geologic Time



                                1      
      2                                
                                       
                                    3  
      4                                
                                       
      5                                
                                       
      6                       7        
                                       
                                       
    8                                  
                                       
9                                      
                                       
  10                                    
                                       
    11                                  
                                       
                                       
Across Down
2 the number of protons and neutrons in the nucleus
4 the present is the key to the past
5 the number of protons and neutrons in the nucleus
6 an erosional surface in the rock record produced by erosion
8 charged particles
9 the time required for one-half of the radioactive nuclei to decay
10 layers
11 layers on each side of the unconformity are parallel
1 unstable radioactive isotope
2 tilted rocks are covered by flat-lying rocks
3 same atomic number different number of neutrons same element with a different mass number
7 makeup an eon
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