Geologic or deep time
A. was originally defined with the knowledge that the Earth is 4.6 billion years old.
B. was originally described using both relative and radiometric age dating techniques that were discovered at the same time.
C. was originally described based on who discovered the most rocks first.
D. was originally described using relative age dating methods such as cross-cutting relationships.
E. was originally described using radioactive isotopes as a dating technique.
Answer: D
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