Question

The longest subdivision in geologic time is a(n) ____.

a. epoch
c. century
b. period
d. eon

Answer 1

The correct answer would be an Eon. The order goes Epoch, Period, Era, Eon.

Answer 2

The longest subdivision of geologic time is an eon. An eon itself is then divided into subdivisions - these are known as eras, periods and epochs. Scientists are able to determine these different time periods by investigating certain geological details or studying fossil records.