The subdivision of the geologic time scale that represents the longest time span is called a(n)________.
A)epoch
B)era
C)period
D)eon

Name: The subdivision of the geologic time scale that represents the longest time span is called a(n)________. A)epoch B)era C)period D)eon
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The longest subdivision of the geologic time scale is called an eon. The current geologic time scale includes four eons: the Hadeon, Archean, Proterozoic, and Phanerozoic.

The Subdivision of the Geologic Time Scale That Represents the Longest