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Geologic Time Crossword Puzzle Answer

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Geologic Time



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                  M A S S E X T I N C T I O N    
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                G E O L O G I C T I M E          
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                    S N O W B A L L E A R T H    
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                    P R E C A M B R I A N T I M E
R E L A T I V E A G E                           X
                    R                     P     T
                    P A L E O Z O I C E R A     I
                    O                     N     N
                A B S O L U T E A G E     G     C
                    I                     A     T
                    T                     E      
        M E S O Z O I C E R A             A      
                    O                            
                C E N O Z O I C E R A            
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3 Event during which many species become extinct during a relatively short period of time.
4 Earth's long history since it became a planet.
5 Term that describes the earth when it was an ice covered frozen planet.
6 The longest part of Earth's history which lasted for about 4 billion years.
8 Age of fossils and rock layer when compared to age of fossils and layers above and below them.
10 Lasted from about 600 million years ago to about 250 million years ago, when basic life forms appeared.
11 Process scientists use to determine the actual age of rocks and other objects.
12 'Age of Reptiles,' lasted from 248 million years ago until 65 million years ago.
13 Our current time which began 65 million years ago, known as the 'Age of Mammals.'
1 Preserved remains of organisms that lived long ago.
2 States that the youngest layer of rock will be on the top if the layers of rock have not been disturbed.
7 No longer in existence, species that have died out and are no longer found living on Earth.
9 Most recent supercontinent on Earth, stretched from pole to pole.
 
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