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How did scientist discover geologic time?

Answer:
Months, years or even centuries aren't helpful for thinking about earth's long history.

Because the time span of earth's past is so great,geologist use the geologic time scale to show earths history.

:they didn't discover much, but they use fossils,DNA,and reacher many things.:
First answer by ID1172825215. Last edit by ID1172825215. Question popularity: 1 [recommend question].

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