Major boundaries in the geologic time scale are often put there based on significant _____ events?
A)tectonic
B)volcanic
C)mass extinction
D)supercontinental breakup

Name: Major boundaries in the geologic time scale are often put there based on significant _____ events? A)tectonic B)volcanic C)mass extinction D)supercontinental breakup
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Question

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Major boundaries in the geologic time scale are often defined based on significant mass extinction events, which represent profound changes in the biosphere.

Major Boundaries in the Geologic Time Scale Are Often Put