Question

Which of the following is the longest division of geologic time?

a.period
b.era
c.year
d.epoch

Answer 1

The answer is option B "era." A era can be up to several millions of years. It isn't period because period can be days to years, it isn't years because it's only one year, wouldn't be option D either because a epoch is up to three million years.

Hope this helps.