Question

The subdivision of the geologic time scale that represents the longest time span is called a

Answer 1

The subdivision of the 'geologic time scale' which represents the 'longest time span' is called an eon.

Step-by-step explanation:

• On the timescale of geologic history, an 'eon' is a period made up of 1 billion years. The one we are living in is the 5th eon.

• An 'era' which is a period shorter than eon lasts for hundreds of million years. Eras are divided in different 'geological periods'.

• An epoch is a geologic timespan of more than 3 million years.

Answer 2

The answer is eon. The subdivision of the geologic time scale that represents the longest time span is called an eon. eons are the longest periods of a geologic time.