on the basis of time the geological history of the earth has been divided in eras
a..2 eras
b..3 eras
c..4 eras
d..5 eras
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The geological history of the earth has been divided into more than 10 eras composing 4 eons.
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Answer:
None of the answers in the option mentioned is correct.
Explanation:
Eon is the largest category in the geological time scale. The history of the earth is categorized into 4 eons:
- Hadeon
- Archean
- Proterozoic
- Phanerozoic
Hadeon is the earliest, while the Phanerozoic is the current eon.
Eons are classified into different eras. An era is the second longest unit of geological scale.
- Hadeon Eon is not divided into eras.
- Archean eon has 4 eras namely, Eoarchean, Paleoarchean, Mesoarchean and Neoarchean.
- Proterozoic eon is divided into 3 eras, Paleoproterozoic, Mesoproterozoic and Neoproterozoic.
- The current phanerozoic era is divided into 3 eras as of now, Paleozoic, Mesozoic, and Cenozoic.
- Cenozoic is the ongoing era.
According to the latest research, there are a total of 10 defined eras.
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