The division of geologic time into eras and periods is based upon a. The coming of ice

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The division of geologic time into eras and periods is based upon
a. The coming of ice ages
b. The disappearance of continents
c. Biological extinctions
d. Worldwide flooding

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The Physical Universe

ISBN: 978-0077862619

16th edition

Authors: Konrad B Krauskopf, Arthur Beiser

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