Final answer:
Eons correspond to the longest chronological spans on the geologic time scale. Eras, periods, and epochs represent progressively shorter timespans, with eras being tens to hundreds of millions of years, periods generally under a hundred million years, and epochs ranging from thousands to millions of years.
Step-by-step explanation:
To match the divisions or subdivisions of time to the proper numerical age, we can assign the following:
- Eon: D. 100s - 1000s Ma
- Era: B. 65-100s Ma
- Period: A. 2-70 Ma
- Epoch: C. 11,000 years - 22 Ma
Eons represent the largest time spans in the geologic time scale, typically hundreds to thousands of millions of years (Ma). Eras are subdivisions of eons and range from tens to hundreds of millions of years. Periods are subdivisions of eras and span millions of years, generally less than one hundred million years. Epochs are even finer divisions, ranging from thousands to millions of years.