What is the geologic time scale generally based upon?
A) The solar cycle.
B) The age of ocean water.
C) Major geological and/or biological events.
D) Dendrochronology.

Name: What is the geologic time scale generally based upon? A) The solar cycle. B) The age of ocean water. C) Major geological and/or biological events. D) Dendrochronology.
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The geologic time scale is based on major geological and biological events, such as mass extinctions and significant changes in Earth's geology and climate.

What Is the Geologic Time Scale Generally Based Upon