Our Changing Earth Vocabulary Part 3 Crossword
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
 
 
Down: 1) the standard method used to divide the Earth's long natural history into manageable parts.2) a example of a species that helped support the continental drift hypothesis3) the largest division of geologic time4) era that began about 66 million years ago, known as the "Age of Mammals".7) era that began 245million years ago, known as age of the dinosoaurs 9) a subdivision of a geologic period. Across: 5) a subdivison of the eras in geologic time 6) a unit of geologic time that includes two or more periods8) the rate at wich species die off 10) occurs when a large proportion of the earths species go extinct in a relatively short period of time 11) era that began about 544 million years ago and lasted for almost 300 million years
 

 

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