GEOLOGY
PALEONTOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Periods
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Eons
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Epochs
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eras
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Detailed explanation-1: -Periods. Just as eons are subdivided into eras, eras are subdivided into units of time called periods.
Detailed explanation-2: -Very significant events in Earth’s history are used to determine the boundaries of the eras. Eras are subdivided into periods. The events that bound the periods are wide-spread in their extent but are not as significant as those which bound the eras.
Detailed explanation-3: -Two or more periods compose on Era. One Era is hundreds of millions of years in duration.
Detailed explanation-4: -The eras are the four major divisions of the geological time scale: Precambrian, Paleozoic, Mesozoic, and Cenozoic.
Detailed explanation-5: -Another common way world history is divided is into three distinct ages or periods: Ancient History (3600 B.C.-500 A.D.), the Middle Ages (500-1500 A.D.), and the Modern Age (1500-present).